Russia’s Emergencies Ministry said that all 10 people on board died in the incident. The Federal Air Transport Agency is launching an investigation into the incident, per Rosaviatsiya: i.e. training of the crew onboard, condition of aircraft, meteorological situation, radio gear

Here is an illustration from @thedailybeast (with flight path from Flightradar24) of the flight that crashed, suspected to have Wagner boss Prigozhin aboard, just weeks after he marched on Moscow, believed to be the largest public challenge to Putin's hold on power in years:

Of course working for more details directly about the incident, but the Russian Ministry of Emergency Services hung up on me when I called asking questions and reached an operator, FWIW

The plane crash is no accident and has likely been in the works since the mutiny, Ronald Marks tells me: "Russia is a mafia-like state. You don’t shoot at the don and miss without consequences...There’s no way in the world...Putin could have allowed him to exist..."