Three members of the Russian Embassy, as well as a Russian delegate at the OSCE responsible for military security and arms control, "carried out activities incompatible with their diplomatic status," Austria's Foreign Ministry said.

The tanker Agioi Fanendes is delivering the first cargo as part of a deal announced by U.S. President Donald Trump on Oct. 9 to purchase Russian diesel.

"This decision to limit critical technology for a key ally... (puts) Ukrainian forces at risk and their people in peril," Senator Richard Blumenthal wrote in a letter addressed to U.S. Defense Secretary Pete Hegseth.