Russian President Vladimir Putin says an opulent palace featured in a video by his arch-critic Alexei Navalny "doesn't belong to me".
The video called "Putin's palace" went viral on Russian social media last week - more than 86m people have watched it.
The palace, by the Black Sea, was allegedly financed by billionaires close to Mr Putin. It is said to have a casino, skating rink and vineyard.
Thousands of people rallied for Mr Navalny across Russia on Saturday.
The 44-year-old, Russia's most prominent opposition leader, was jailed a week ago for 30 days, accused of parole violations. The survivor of a near-fatal nerve agent attack last August, he was arrested upon his return to Moscow from Berlin on 17 January.
Mr Putin called the palace video a "compilation and montage" and said he found it "boring".
"Nothing that is listed there as my property belongs to me or my close relatives, and never did," Mr Putin told students in a video conference.
He had watched bits of it - he had no time to watch all of it, he added.