Britain has sanctioned ten ships in Russia's "shadow fleet" of vessels, which it says use illicit practices to avoid Western embargoes on Russian oil.
"Today’s sanctions further undermine Russia’s ability to trade in oil via its shadow fleet," British foreign minister David Lammy said in a statement on Wednesday.
"Alongside our partners, we will continue to send a stark message to Russia that the international community stands with Ukraine, and we will not tolerate this illicit fleet."