Censor.NET reports citing The Wall Street Journal columnist Laurence Norman referring to current and former policy makers.
The U.K. has played a major role in the EU's growing use of sanctions policy, according to Richard Nephew, the former No. 2 State Department official for sanctions policy.
"Britain has been a significant defender of sanctions against Russia over its interventions in Ukraine, acting as a big-power ally for German Chancellor Angela Merkel and a counterweight to the likes of Italy and Greece.
"The U.K. played a key role by choking off funding for Russian state-owned firms in London, Europe's most powerful financial center," Norman notes.
Fredrik Wesslau, senior policy fellow at the European Council on Foreign Relations, believes that a few years down the line, when the U.K. is not a member of the European Union, the policy towards Russia will get softer.
"However, few experts expect an abrupt change. The U.K. will remain in EU meetings until it formally leaves, though with declining influence," the journalist concludes.