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The US not committed to not using nuclear weapons in a first strike . Russia along with most countries have agreed to ONLY use nuclear weapons in defensive use!!! So this is only fantasy !!!
The possibility Putin resorts to Nuke is 50 percent. The only thing that can prevent him of using nukes are potential negative reactions of the US, West, NATO, China, India, Pakistan, NK and other when using nukes. Conventionally Russia already loses the war. Putin can avoid the immediate defeat by sacrificing more hundreds thousands of Russians. But he can’t avoid the defeat eventually.
The US, NATO have plans to respond to Soviet’s Nukes. They will use the same plans to respond to Russia nukes.
The US not committed to not using nuclear weapons in a first strike . Russia along with most countries have agreed to ONLY use nuclear weapons in defensive use!!! So this is only fantasy !!!