No one will launch nukes without previously being attacked with nukes, because that is a kind of no return "fuck you all" button that would throw humanity back to the middle age.

Why? after the isotopes comes the destabilization of the country, hunger and pain. The systems are designed to give no country or power an advantage in such weakness scenario, continental nukes would fly to and from all world powers, Moscow would blow itself up, it would be self-destruction.

PS: This doesn't mean I agree with the comment you are replying to, the events are quite strange and should be taken with suspicions.