Europe doesn't want to run an empire nor go to war with China. Defending the borders is enough.
And a few hundred nukes targeting US cities just in case.
They don’t even have nuclear power anymore - they shuttered the last of their nuclear power plants. The entire supply chain will need to be developed and tested without running afoul of the test ban treaty.
Besides, nuclear weapons are almost worthless without submarines to carry them. They’d only be useful against an unsophisticated adversary.
Basically, it would send Europe back into the stone age, I fear. In under a week.