Britain targeted Russian troops involved in using chemical weapons on the battlefield in Ukraine with sanctions on Tuesday, accusing Russia of "cruel and inhumane tactics".
Among those sanctioned on Tuesday were the Radiological, Chemical and Biological Defence Troops of the Russian Federation and its leader Igor Kirillov, the government said in a statement.
"The UK will not sit idly by whilst Putin and his mafia state ride roughshod over international law, including the Chemical Weapons Convention," foreign minister David Lammy said in a statement.
The Russian embassy in London did not immediately respond to Reuters' request for a comment on the sanctions.
The fresh sanctions come a week after the government sanctioned 16 members of the Russian cyber-crime gang Evil Corp, a group it said had been tasked by Russia to conduct operations against NATO allies.
