The US has accused Russia of giving fugitive US intelligence leaker Edward Snowden a "propaganda platform".
President Barack Obama called Vladimir Putin after Snowden met human rights groups at a Moscow airport - his first appearance since fleeing there from Hong Kong three weeks ago.
Snowden has been charged with leaking classified US information.
He says he is seeking asylum in Russia to be able to travel to Latin America where he has been offered refuge.
The head of the Federal Migration Service said that however no request from Snowden had arrived yet.