The rouble-based MOEX index hit an all-time high of 3,949.07 points on Aug. 18, before fading as prices for oil, Russia's main export, tumbled. But passing the 4,000 threshold seems only a matter of time
A trading frenzy by retail investors on online forums such as Reddit's WallStreetBets in the United States sent some stocks, including GameStop, to meteoric gains earlier this year. That fuelled a copycat trading boom in Europe, raising concerns about so-called "meme stocks" in Russia.