Couple of open source intelligence types reporting the Moskva has stopped all transmissions. This could be because all crew has left the ship, or because its sunk to the bottom of the Black Sea.
At least one report claims to have intercepted Russian radio transmissions from rescue craft a few hours ago, stating the ship had rolled onto its port side and was still on fire.
There are unconfirmed reports that she is sinking. Apparently the crew has abandoned ship.
Please be true, and way to go Ukraine!