The US, FR, and GB with Israel will kill Russia.
No, we can't. First of all, we don't have enough nukes to do it, except the situation in which the Russians are doing nothing to protect themselves. More likely, in the treating situation the Russians will attack first, or, at least make some preparations for our attack (even if we are planning Mad Butcher scenario - suicidal out of blue attack against their sleeping cities).
But the main problem is not just attack. The main problem is to survive their retaliation strike (and for them the main problem is to survive our retaliation strike). And, therefore, the first strike must be counterforce. But now the US Nuclear Forces (as well as our Non-existing civil defense) can't suggest any reasonable plan for such an attack which would allow to decrease the number of US casualties to the acceptable level (which is one million for any Eurasian war, and say, fifty million for an American war).
America wants to take Crimea and Novorussia, but not ready to pay more than one million of her citizens for it. America wants to keep Alaska and California and ready to pay up to fifty million citizens for it.
Russia wants to take Alaska and California, but not ready to pay more than one million citizens for it. Russia wants to keep Crimea and Novorussia and ready ready to pay up to fifty million citizens for it.
So, if you don't have a reliable plan how to kill more than fifty million of well-prepared Russians and, simultaneously, prevent the death of more than one million of Americans, the USA won't attack Russia (at least their cities) in the case of any limited European nuclear war.
But if we are talking not only about Alaska or Crimea, but about the very existence of our states, the situation becomes more challenging. There is no upper limit for deaths and there is no place for surrender.