“How do you feel, being — at a net worth of $260 billion roughly — perceived as the richest person on earth?” Mathias Döpfner, the CEO of Insider’s parent company, Axel Springer, asked Musk during a recent interview.

“I do think that Putin is significantly richer than me,” Musk replied.

Russian President Vladimir Putin’s massive wealth remains a mystery in that nobody knows exactly how much of it there is, or where it is stashed. Putin has been linked to a $1.4 billion palace on the Black Sea and a $4 million Monaco apartment.

Some have speculated the Russian president may be the richest man in the world, with financier Bill Browder, testifying in 2017 that he believes Putin “has accumulated $200 billion of ill-gotten gains.”