There will need to be a very serious effort to secure nukes and that might be a problem in a civil war where elements of the military cannot be trusted to take sides. They'll need to be very careful with any major site especially nukes, etc. Then China and Russia will really be demanding intervention to confiscate anything that could be lost control of and then a threat to them.

Some nukes may need to be stowed away with an ally or unusual territory, etc. There are already contingency plans for this going back decades though it's still quite messy.

There will need to be a very serious effort to secure nukes and that might be a problem in a civil war where elements of the military cannot be trusted to take sides. They'll need to be very careful with any major site especially nukes, etc. Then China and Russia will really be demanding intervention to confiscate anything that could be lost control of and then a threat to them.

Some nukes may need to be stowed away with an ally or unusual territory, etc.