"I am in Moscow at the moment. I do not know who has been spreading these lies and why. It is either a joke or a deliberate provocation," the Russian opposition activist said.
Udaltsov said he had recently returned from Yaroslavl, where he and "local activists discussed their participation in the March of a Million in Moscow on May 6."
Left Front Council member Dmitry Galkin told Interfax earlier that Udaltsov had not been able to attend a congress of Ukraine’s Borotba (Struggle) left-wing party in Kyiv on Monday because he had allegedly been detained on the Russian-Ukrainian border.