Swedish and German forces are conducting what appears to be the first joint rehearsal of their rapid-reinforcement plans for the Baltic island of Gotland. The exercise is another step in Sweden’s defense planning for an island whose position in the middle of the Baltic gives it an outsized strategic importance for controlling access, protecting the Baltic states, and maintaining NATO’s freedom of movement in a region where Russian military activity remains a persistent concern.

The exercise, Silver Wotan 2026, running between September 14-23, brings together Swedish and German forces across the land, maritime, and air domains. The scenario is built around a Swedish request for allied assistance, with German forces moving personnel and equipment across the Baltic before integrating with Swedish units already defending the island. The operation is testing the entire process of getting allied combat power to Gotland, protecting it during the movement to Visby, and rapidly incorporating it into the island’s existing defensive network.

A video shows troops coming ashore on Swedish CB90 fast assault craft, a type that German soldiers are also trained to operate:

A rapid deployment of German and Swedish forces to Gotland island is being carried out today. Units from and are rehearsing the swift reinforcement of the strategic island in order to ensure the security of the Baltic Sea.#SilverWotan#NATO pic.twitter.com/A0r3LF8XUP

— Försvarsmakten (@Forsvarsmakten) September 18, 2026

The strategic importance of Gotland has grown considerably following Sweden’s accession to NATO in March 2024, which was a direct response to the full-scale Russian invasion of Ukraine.

Located approximately halfway between mainland Sweden and the Baltic states, the island occupies a central position in the Baltic Sea, close to the maritime approaches to the Gulf of Finland and within reach of the Russian exclave of Kaliningrad. Its location gives forces operating from Gotland a potentially significant position from which to conduct surveillance, air defense, and maritime operations, while also making the island an important part of the wider network connecting NATO’s northern and eastern members.

At the same time, Gotland sits within an extremely complex littoral environment, where shallow waters, islands, narrow maritime approaches, and the proximity of multiple states can make both offensive operations and defensive planning more difficult. The region has also been shaped by longstanding Swedish concerns about Russian clandestine activity, including intelligence gathering and other forms of covert or deniable activity. The complexity of the Baltic operating environment can make such activities harder to detect and attribute, adding another layer of uncertainty alongside the more conventional military challenges facing the region.

Geography has long made Gotland important to Swedish defense planning, but its significance has taken on a broader dimension since Sweden joined the alliance. NATO has described the island as strategically important to its freedom of maneuver in the Baltic, while Swedish officials have highlighted its potential role as a hub for military operations and logistics in the region.

The current exercise is designed around the practical difficulties of reinforcing such a position.

Military equipment is being transported by sea to Visby, Gotland’s principal port, including by commercial ferry. In Visby, Swedish and German personnel are securing the harbor and conducting the reception of the arriving force. Among the equipment being moved are air defense systems, while Swedish forces are also operating coastal defense systems armed with anti-ship missiles.

Meanwhile, publicly available flight-tracking data showed German Luftwaffe transport aircraft, including at least one Airbus A400M airlifter, apparently involved in the effort. The commercial airport at Visby has long also been used for military activities related to Gotland and the wider Baltic region.

”A rapid deployment of German and Swedish forces to Gotland island is being carried out today” https://t.co/z6oLs1LCT4 pic.twitter.com/n18MdST6r1

— Jamming (@balticjam) September 18, 2026

The movement is supported by Swedish and German naval forces and other aircraft, creating a scenario in which the maritime transit, protection of the port, air operations, and subsequent movement of troops and equipment ashore all form part of the same military problem. Once ashore, the arriving forces have to be moved into position and integrated with Swedish units already responsible for defending the island.

The Swedish Gotland Regiment, P 18, provides the core of the island’s permanent military presence. The regiment, Sweden’s youngest and smallest, has been rebuilding its capabilities since Sweden began expanding its military presence on Gotland. Its forces form the basis of the ground-defense structure into which allied reinforcements would be incorporated.

Swedish coastal defense capabilities are another important element of the drill. Land-based anti-ship missiles provide the island with a means of threatening hostile surface vessels operating in the surrounding waters, giving the defense of Gotland a direct connection to the wider maritime battle for the Baltic. During Silver Wotan, Swedish and German forces are also conducting anti-surface warfare activities alongside the broader reinforcement operation.

Germany is contributing more than 500 troops to the exercise, part of approximately 2,000 Bundeswehr personnel involved, including elements from the army, navy, and air force. The German Luftwaffe has deployed Panavia Tornado aircraft for surveillance, while German naval forces are participating in the maritime component, and German ground personnel are involved in the reinforcement and security activities on Gotland.

The exercise scenario is particularly relevant against the backdrop of Russia’s continuing military presence in the Baltic region.

Russia maintains major military infrastructure in Kaliningrad, including naval, air, missile, and air defense capabilities, while the Russian Baltic Fleet operates from bases in the region. Kaliningrad’s position between Poland and Lithuania gives Moscow a significant military foothold inside the NATO area, while Russian forces and military infrastructure elsewhere along the Baltic add to the complexity of operating and reinforcing allied territory in the region.

The security environment around the Baltic has also deteriorated considerably since Russia’s full-scale invasion of Ukraine. NATO has increased its surveillance and military activity in the region, including the launch of Baltic Sentry in January 2025 following a series of incidents involving critical undersea infrastructure. The alliance has subsequently expanded efforts to monitor maritime activity and protect infrastructure and sea lines of communication.

Swedish authorities have stressed that Silver Wotan was planned in advance and is not being conducted in response to a specific imminent Russian threat. The exercise nonetheless reflects the operational environment in which Swedish and NATO planners now have to consider the possibility that maritime and air movements across the Baltic could be monitored, disrupted, or contested.

The exercise also builds on a series of increasingly large Swedish-led activities designed to test the reception of allied forces on Swedish territory. During Aurora 26 earlier this year, more than 18,000 troops from 13 countries participated in operations across Sweden, including the deployment of allied forces to Gotland alongside the Gotland Regiment and Swedish Home Guard. NATO described that activity as an emergency deployment intended to test the reinforcement of the island.

Silver Wotan places a more concentrated emphasis on the Swedish-German relationship and on the movement of an allied force into the island’s existing defensive structure.

Germany’s participation is also consistent with its growing military role in the Baltic and along NATO’s northeastern flank. Berlin is already providing forces for NATO’s forward defense in Lithuania and has increasingly emphasized the ability to move German forces rapidly across northern Europe in support of allied operations.

For Sweden, meanwhile, Gotland has become one of the clearest examples of how NATO membership has changed the country’s defense planning. The island remains a Swedish responsibility, but its location means that what happens there has consequences well beyond Sweden’s territorial defense.

A defended and adequately supplied Gotland provides NATO with a strategically positioned base for surveillance and defensive operations in the Baltic, while the ability to reinforce it demonstrates that the alliance can maintain access to the island even as the surrounding maritime and air environment becomes more contested.

The exercise comes as European allies are being forced to plan for a NATO in which the United States may provide less of the conventional military weight it has supplied for decades. The Pentagon is reviewing the size and posture of U.S. forces in Europe, including the forces and capabilities Washington would make available in a European crisis, while NATO’s top commander has said further U.S. troop withdrawals should be expected as European allies build up their own conventional capabilities.

At the same time, the alliance now describes Russia as its most significant and direct security threat, citing military activity alongside airspace violations, sabotage, cyber operations, and other forms of hybrid pressure. There are also growing concerns that Russia could try something in the Baltics, while it continues to step up its gray-zone activities regardless. NATO officials have warned that Russia could rebuild enough military capacity to pose a more serious conventional challenge to the alliance before the end of the decade.

There are escalating warnings from Poland that Russia is preparing to widen its war against Ukraine, with "accidental" missile and drone strikes on NATO territory.

Such a move – Russia falsely claiming air strikes that hit NATO allies happened by accident – would be designed to…

— Deborah Haynes (@haynesdeborah) September 18, 2026

For Sweden and Germany, the Silver Wotan exercise is a practical test of how quickly European forces can reinforce and defend one of the Baltic’s most strategically important positions. As the security environment grows more contested and Europe prepares for a future in which U.S. forces may not be as readily available, the ability to move allied combat power across the region and integrate it into existing defenses is becoming an increasingly important part of NATO’s deterrence.

Contact the author: thomas@thewarzone.com

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Japan has said it is keeping the door open to acquiring nuclear-powered submarines, a potentially major shift for a country whose submarine force has historically relied exclusively on conventional propulsion. Defense Minister Shinjiro Koizumi confirmed recently that Tokyo is not ruling out nuclear-powered submarines as it considers the future requirements of the Japan Maritime Self-Defense Force (JMSDF).

Should Japan ultimately pursue the capability, it would join an exclusive group of nations operating nuclear-powered submarines. China, France, India, Russia, the United Kingdom, and the United States are currently the only countries with nuclear-powered submarines in active service. Brazil is already working to join the club, while Australian and South Korean nuclear-powered submarine plans are somewhat longer-term.

Japan’s submarine fleet is already regarded as among the most capable conventionally powered forces, and is very much at the forefront of advanced naval propulsion technologies. Even with that considerable expertise, however, developing and sustaining a nuclear propulsion capability would represent a huge challenge, requiring expertise and infrastructure far beyond those needed to build Japan’s existing conventionally powered submarines.

Koizumi’s comments do not represent a decision to acquire nuclear-powered submarines, nor do they indicate that Japan has begun a procurement program. They do, however, mark a significant evolution in the country’s public debate over submarine propulsion and point to a growing willingness within the Japanese defense establishment to consider capabilities that were previously largely outside the mainstream of defense planning.

Currently, Japan operates one of the world’s most capable conventional submarine fleets, centered on increasingly sophisticated diesel-electric boats equipped with air-independent propulsion and advanced lithium-ion batteries. These submarines are well suited to operations around Japan and the country’s surrounding waters.

The JMSDF currently operates 22 conventionally powered submarines, maintaining the force structure established in the 2010s while progressively replacing older boats with the more capable Taigei class. Five Taigei class submarines are now in JMSDF service, with additional boats in the pipeline.

Nuclear propulsion, however, would offer substantially greater endurance and sustained underwater speed, allowing Japanese submarines to conduct longer-range operations across the broader Western Pacific with minimal support. This is a requirement that is becoming increasingly relevant as Tokyo’s strategic focus expands beyond its immediate maritime approaches.

China’s rapidly expanding naval force, including its growing submarine fleet and increasingly distant maritime operations, is forcing Tokyo to consider how it would monitor and potentially counter Chinese forces farther from the Japanese archipelago. A nuclear-powered attack submarine could remain submerged for extended periods without the endurance limitations imposed by conventional propulsion, making it particularly useful for long-range surveillance, tracking, and sea-denial missions.

Japan’s debate is also unfolding alongside a significant development in neighboring South Korea. Seoul has confirmed plans to develop a new class of nuclear-powered submarines, a move that could add further momentum to an emerging undersea competition in Northeast Asia. South Korea’s decision is particularly relevant to Tokyo because it demonstrates that nuclear propulsion is no longer merely a theoretical capability for U.S. allies in the region. While the missions and strategic priorities of the Japanese and South Korean navies are different, both countries face the challenge of operating in waters increasingly contested by China and North Korea.

The development could also create new opportunities for Japan to work more closely with Australia and the other AUKUS partners. Australia is in the process of acquiring its own conventionally armed, nuclear-powered submarine capability under AUKUS Pillar I, with U.S. and U.K. nuclear-powered submarines also scheduled to operate from Australia. Japan has separately been identified as a potential partner for AUKUS Pillar II, which covers advanced capabilities and technology cooperation.

A Japanese decision to pursue SSNs could eventually create a much deeper basis for cooperation with Australia, including submarine interoperability, undersea warfare, workforce and technical expertise, infrastructure, sustainment, and potentially aspects of the industrial base. Analysts have already examined how Japan could fit into the wider AUKUS submarine ecosystem as Australia’s nuclear-submarine program develops.

A Japanese nuclear-powered submarine with a robust capacity to launch land attack cruise missiles would also be a powerful component in the country’s emerging “counterstrike” posture, which is increasingly centered on acquiring the ability to strike targets at longer ranges.

Japan has already begun deploying domestically developed long-range missile systems, including the Upgraded Type 12 surface-to-ship missile, while also acquiring the U.S.-made Tomahawk cruise missile.

An SSN would potentially add a highly survivable, mobile platform to this emerging strike architecture, allowing Japan to position long-range weapons farther from its home territory and complicating an adversary’s efforts to locate and neutralize them. That could be particularly valuable in a conflict in which Japanese air bases, missile batteries, and other fixed infrastructure were under attack.

The potential SSN requirement also fits with Japan’s expanding expeditionary ambitions. As the JMSDF converts its Izumo class helicopter destroyers to operate F-35B fighters, giving Japan a more credible carrier aviation capability, nuclear-powered attack submarines could provide a valuable escort for these increasingly important surface groups. Their speed, endurance, and ability to remain submerged for extended periods makes SSNs particularly well suited to accompanying carrier forces on longer-range deployments and supporting contingencies farther from Japanese waters.

Looking at the bigger picture, it is highly significant that nuclear propulsion was effectively excluded from Japan’s conventional defense debate for decades. More recently, however, Japanese defense officials and policymakers have begun examining whether future submarines will require a different propulsion system. The issue is now one that can be discussed openly at the ministerial level.

Nevertheless, pursuing a nuclear-powered submarine program would come with huge challenges.

Building and operating nuclear-powered submarines would require Japan to establish an entirely different industrial, regulatory, and training infrastructure. The vessels would also be considerably more expensive and complex to build and operate than Japan’s existing conventionally powered submarines. Tokyo would have to resolve questions involving nuclear regulation, reactor technology, maintenance facilities, crew training, and the handling of nuclear material.

There would also be a significant political dimension. Although naval nuclear propulsion is fundamentally different from possessing nuclear weapons, any move in that direction would inevitably receive scrutiny in a country whose postwar security policy has been shaped by its experience with nuclear weapons and its longstanding non-nuclear principles.

For those reasons, Koizumi’s statement should be viewed less as an announcement of a Japanese nuclear-submarine program than as evidence that the political barrier to discussing such a program is falling.

The next question is whether the Japanese government will move from keeping the option open to actually studying a nuclear-powered submarine design, propulsion technology, and acquisition pathway in detail.

If it does, the consequences could extend well beyond Japan’s submarine fleet. A Japanese nuclear-powered submarine capability would represent a major enhancement of Tokyo’s ability to operate across the Western Pacific and could alter the undersea balance between Japan, China, and the United States’ other regional allies. At the very least, the idea is one that is now part of wider discussions at the highest levels.

Contact the author: thomas@thewarzone.com

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