I know this, if they launch a couple of tactical nukes, then the psychopath will order the full mobilization of the US, and almost certainly suspend any midterm election, which is probably why the psychopath has done everything short of sending US forces into direct combat with Russia, including blowing the Nordstream, and Kerch bridge!
While I do not necessarily support Russia, I also do not necessarily oppose them and their actions in Ukraine, the boogeyman here is the psychopath, Biden did this, Biden is the most evil human to ascend to such power since Stalin, Hitler, and Mao.
That said if Putin detonates a nuke or two, he can absolutely be assured his black sea fleet will be splashed in total, along with all Russian forces in theater! Putin is nobodies fool, he's not very likely to take the bait and hand Biden exactly what he wants more than anything else on earth!