A Russian source is saying the Moskva has sunk and that the explosion was from a Ukrainian Neptun missile strike. Apparently, Ukraine flew a TB2 UCAV to distract the ship while it was targeted by the Neptun. The ship rolled onto its side after the strike.
https://twitter.com/RALee85/status/1514398732611211271
#2. More likely, the drone was used for targeting, possibly for decoying (jamming or dropping chaff), then Russian antimissile defenses were saturated by multiple missiles. If the ship really was sunk, then the Russian Navy’s history of poor damage control was a factor in her loss.
Ship’s complement 510 sailors. If in fact ship rolled, rescue seems somewhat complicated.