The United States has intensified its targeting of the shadow fleet that Russia uses to transport its oil and bypass Western sanctions. About half of the 50 tankers that the US Treasury began imposing sanctions on last October 10 have failed to load shipments since they were included on the list.

The most recent target was the tanker NS Leader, affiliated with the Russian company Sovcomflot, which withdrew from completing a voyage off the coast of Portugal when the United States included its owner among the sanctions. The G7 imposed a ceiling on the price of a barrel of Russian oil at $60 per barrel.