Russia admits its 14,500 tonne cruiser Moskva, flagship of the Black Seas Fleet, sank on April 14, 2022, with no reported casualties (?). It remains unclear whether Moskva’s fire (resulting in ammunition exploding) was caused by Ukrainian Neptune anti-ship missiles. The fire apparently started around 100km off the Ukrainian coast, well within the 300+ km range of truck launched Neptune missiles. It is unclear whether Moskva was carrying any nuclear warheads on some of its SS-N-12 Sandbox large supersonic "carrier killer" cruise missiles.
The fire may have been yet another instance of poor Russian maintenance, seen earlier in the submarines Kursk, Orel and Losharik, not to mention a crane and fire damaging Russian carrier Admiral Kuznetsov.