Certainly possible. After all, the US lost a major warship to a fire less than two years ago.
The coincidences tend to pile up on the Moskva, though. In a war zone, high-value target, obvious propaganda victory for Ukraine, etc. And the Bonhomme Richard was in port, undergoing maintenance with the fire suppression gear turned off.
There is, of course, a third possibility for what happened to the Moskva: Sabotage. If the ship *hadn't* been hit by missiles, I'm sure the Russian naval security folks are tearing through the crew right now. After all, the US Navy has charged an apprentice seaman for arson on the Bonnie Dick; an operational cruiser on war patrol is probably much easier to damage. Considering the Russians' problems with conscript morale, if it WASN'T a missile, they've got to be plenty worried. Traditionally, Russia drafted men into the navy for longer service than the army, not unlikely this ticked off some men. Anyone on board with Ukranian connections....?
Ron Wanttaja