Britain says concerned about Russia may move further into Ukraine

Britain's Foreign Secretary William Hague makes remarks after being presented the Georgetown University's annual Hillary Rodham Clinton Award for Advancing Women in Peace and Security, at Georgetown University in Washington, February 25, 2014. REUTERS/Mike Theiler

LONDON (Reuters) - Britain said it was very concerned about the possibility that the Kremlin might send troops further into Ukraine and cautioned President Vladimir Putin that Russia would pay significant costs unless he changed course.

British Foreign Secretary William Hague said the Russian intervention in Ukraine was the biggest crisis in Europe so far this century.