Russian authorities have released a leading figure in the Russian opposition who was detained earlier in the day upon his arrival on a flight from Kyiv.
Ivan Starikov, a senior member of the Solidarnost (Solidarity) movement, was taken into custody after disembarking at Moscow's Sheremetyevo Airport.
Solidarnost Press Secretary Olga Shorina told RFE/RL's Russian Service that police seized Starikov's mobile phone after detaining him.
Moscow police declined to comment.
Starikov used to be an active member of Russia's opposition Union of Rightist Forces and was one of the founders of the Solidarnost movement last year.
The leader of Russia's United Civic Front, former world chess champion Garry Kasparov, called Starikov's detention "the every day routine of the Russian opposition."