Putin would never launch a nuke. Better to “gift” one to Iran. who can give it to a group-—sneak it over the border as “drugs” and detonate it at a soft target or city. Maybe Atlanta or San Diego? Russians can say they have no idea where it came from? So sorry? Then, say its a false flag operation on the part of the USA to start a war.
Every nuke has a kind of fingerprint that identifies the source. If Russia gives someone a nuke and it gets used we’ll know it was a Russian nuke.