Foreign Minister Sergei Lavrov said Zakayev's French trip raised "serious questions."
Zakayev, who has political asylum in Britain, attended a June 27 meeting of the Parliamentary Assembly of the Council of Europe, a human rights and democracy body based in Strasbourg.
Moscow claims Zakayev has been involved in terrorist attacks.
(AFP, Interfax, ITAR-TASS)
RFE/RL In Russian
UPDATED CONSTANTLY: Visit RFE/RL's Russian-language website, featuring news, analysis, features, streaming audio, and more, in Russian, from RFE/RL's Russian Service.