I would need a few clear verifiable sources to believe  that Zelensky is asking from preventive strikes or for that matter, anything that means using or attacking nuclear weapons.  In a nuclear war there is no winner. The first strike is guaranteed to be followed by a response (it could even not be a nuke, but certainly proportional and devastating)... and from there nobody knows.

A different thing is asking about readiness in case Putin and the Psychos think they have nothing to loose and recur to a tactical nuke or a limited nuclear mid range cruise.

RE bridge of Crimea, in my understanding it simply means that the US and possibly allies have made clear that they can also destroy expensive and critical infrastructure "outside-ish RF territory" as the RF has destroyed the Nord Streams "outside NATO territory". Seems that Mafia rules have found an equivalent response.

On the tactical side, that bridge down means that it will be slightly more difficult to reinforce or trade with Crimea and more expensive to maintain it as RF controlled territory.

Oh, by the way, the orc slaves seem to be having patriotism issues with the Rodina. They insist on eating. https://www.youtube.com/watch?v=dWLYcfRC0jE