
Russian President Dmitry Medvedev says Iran is "moving close" to having the potential to create nuclear weapons.
Two of the four Russians expelled from Moscow in a spy swap are reported to be staying undercover in a British hotel.
The US considered a spy swap with Moscow more than two weeks before it arrested 10 Russian agents, US officials say.
US Vice-President Joe Biden tells a TV chat show that sending a glamorous spy back to Russia "was not my idea".
Fourteen people exchanged in Vienna, in the biggest spy swap since the Cold War, are flown to Russia and the US.
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