"Per the Russian authorities". Those are very important keywords. And the abrupt cancellation of the second passenger who was supposed to join them just before the crash site is highly suspicious. I find the untimely deaths of all of the other crypto millionaire/billionaires highly suspicious and none of them look to me can rule out foul play. A 30-year dying in his sleep?? Was there ever any mention of any known or unknown hereditary cardiovascular disease or any serious illness? Is there any known habits of recreational drug or alcohol abuse? No. A 29-year drowning?? On a beach?? Does the guy not know how to swim? No. What's the cause of his drowning? Unknown. Were autopsies ever done on these deaths? No.
There's also the "that which cannot be mentioned/suddenly died" possibility. But I didn't say that. Everyone go get their 12th booster shot and save grandma! But yeah, there are other possibilities, too...kind of like all those people affiliated with the Clintons who decided to jump of the 30th floor of condos or put themselves in a noose AND shoot themselves in the middle of nowhere in Arkansas...because suicides, man.
Actually Ken Starr 's magic suicides when you know what's what. Just like Jeffrey Epstein's gravity defying 'hanging'.