Alexander Litvinenko was slipped radioactive poison in 2006. As an inquiry opens into his murder, the mystery deepens.
Both men are accused of spying for Belarus, a close ally of Russia.
Former CAPO agent Uno Puusepp has been unveiled as a double agent for Russia's FSB
How the CIA, FBI, and other agencies hired and protected former Nazis and Nazi collaborators in the name of the Cold War
Sentenced to prison during the Red Scare, the New Jersey woman says she now has evidence to prove her innocence.
Turkish foreign ministry summons German ambassador and calls for Berlin to cease espionage activities "immediately"