It's has already been offered, enough supply to cover their annual requirements from the USA would be piped through to them by Poland.... but Orban refused!
Depends on the locations and amount of war heads used.
It's would take 100 nukes going off at the same time in the same place to change the global temperature. something that is unlikely to happen even in a full-blown exchange.
My country had 12 open-air nuclear explosions in 5 years, we're fine
Of course, it clashes with ruzzias demands.... if the front line is frozen now, ruzzia will have destroyed decades of military and economic build-up, followed by a huge recession to achieve NONE of the SMO's stated goals!