Shipments of liquefied natural gas through the Strait of Hormuz extended a rebound that began in September, as the region’s producers seek to restore supplies to energy-starved customers.

The number of shadow-fleet vessels carrying Russian oil and LNG through the Northern Sea Route has surged this summer, according to a new analysis by the Bellona Environmental Transparency Center, raising concerns about the ability to respond to accidents in one of the world's most remote shipping environments.