Sigal P. Mandelker, a top US Treasury official in London to meet her counterparts, said on Tuesday that British banks could face “consequences” if they continued to carry out significant transactions on behalf of the 24 influential Russians sanctioned by Washington last week, the New York Times reported. The list included Russian President Vladimir Putin’s son-in-law Kirill Shamalov and industrialists Oleg Deripaska and Viktor Vekselberg. “These are blocking sanctions,” said Mandelker, Under Secretary of the Treasury for terrorism and fincial intelligence. “There of course would be consequences for UK fincial institutions” that continued to do business with the Russians, he warned.