Russian opposition leader Alexei Navalny said Tuesday he was prevented from flying out of a Moscow airport to travel to France and attend the European Court of Human Rights.
"Border guards are saying that leaving is forbidden for me. There is some kind of letter that says I am prohibited from leaving, but there is no explanation why," Navalny wrote on Twitter.
He said he had planned to board a flight to Frankfurt and on to Strasbourg, where the court was expected to rule Thursday on whether his detentions in Russia this year were politically motivated.
Navalny's lawyer Ivan Zhdanov tweeted a photo of the document barring Navalny from leaving Russia.
The 42-year-old anti-corruption campaigner was released from a Moscow detention centre last month after being sentenced to 20 days for organising anti-Kremlin protests.
He also served a 30-day sentence in September for organising a rally at the start of the year.
Amnesty International then described him as a prisoner of conscience and said he had committed no crime.
Navalny came to prominence as an organiser of rallies against President Vladimir Putin that shook Russia in 2011 and 2012 following accusations of vote-rigging in parliamentary polls.
His anti-corruption rhetoric is especially popular with younger people who follow him online.
