It isn’t sunk. It was evacuated and is getting towed to port.
The 3rd option is the US gave the Ukrainians a little help aiming their weapons.
Russians: Ammunition just kind of blew up...like on that other ship.
Observer: you mean the one that Ukraine hit with a guided rocket artillery.
It would make for interesting theater for the Moskva to be towed to Sevastopol only to be sunk under a hail of Ukrainian missiles at the harbor’s entrance.