Having lived through 30 something years of the Cold War you realise that proxy wars do not lead to WW3 as everyone loses if that happens. Putin may or may not be declining with age but he is surrounded by people who will be turned to ash or will spend their last days in a bunker that stinks of potatoes and BO if nuclear weapons are used.
It would require an genuine invasion of Russia's territory by NATO before nuclear weapons were even seriously considered as a viable option. The Russians like to scare people because they are actually weak both economically and militarially. It's a bluff and it needs to be called.
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