> not sure how it could be confirmed
The Ukrainians were reportedly flying a Bayraktar TB2 drone nearby at the time (used as a spotter/distraction for their 2 Neptun anti-ship cruise missiles), and might have video footage. Whether they would want to release it is another story.
There could plausibly be intercepted audio of radio conversations among the Russian military.
Aside: The current Ukrainian gov’t response is pretty snarky: “Oleksiy Arestovych, aide to Zelensky administration chief of staff Yermak, likens fire at Russia’s flagship cruiser Moskva to blast at Belgorod fuel depot, says both happen to appear as some bad luck.” https://twitter.com/myroslavapetsa/status/151440038235680358...