2. Would probably be "just" sinking black sea fleet with a non-nuclear bombardment or equal. The consequence needs to be a loss that has political and military

2. Would probably be "just" sinking black sea fleet with a non-nuclear bombardment or equal. The consequence needs to be a loss that has political and military significance but does not need to more than necessary. 3.& 4. Would mean Russia's self annihilation and they won't go there. It's no joke that nuclear powers are saber rattling ofc.