Russia expels British diplomat for spying

Russia on Tuesday expelled a British diplomat it accused of spying, telling London it would not tolerate "undeclared" intelligence officers operating on its territory, accusations that have ignited a fresh diplomatic feud with London.

Britain has rejected the claims one of its embassy employees was a spy, the latest in a string of espionage allegations that come with relations between the two countries running at an all-time low.

The spat also comes a week after Ukraine was given permission to start firing UK-supplied long-range missiles at Russia -- drawing scorn and threats of direct military retaliation from President Vladimir Putin -- and after Russia arrested a British man captured fighting for Ukraine.