He died after falling from a sixth-floor window at the Central Clinical Hospital in Moscow in September 2022. In April, top energy boss Igor Shkurko, 49, was found dead, adding to the number of mystery deaths of oligarchs in the country. The body of the deputy general director of Yakutskenergo was discovered in his cell in a detention centre after he was accused of taking a bribe. And in May, a minister who is believed to have privately condemned Putin's invasion, also died under mysterious circumstances. Petr Kucherenko, 46, suddenly became ill on a flight while returning to Moscow from a business trip in Cuba on May 20. Doctors rushed to give deputy science minister Kucherenko CPR after the plane made an emergency landing, but he was pronounced dead.