Is anyone really surprised? The "west" keeps escalating, while openly mocking and questioning Russian nuclear deterrent. First it was "They have no missiles!". Then when it turned out they have missiles, it was "Their missiles are just for show, they'll never launch". Then it was "Even if they launch, they'll never hit their targets".
If your country banks on it's nuclear arsenal to keep everyone from interfering with it's affairs, and the viability of your arsenal is being put into question by your opponents, from politicians, to media, to people in the streets, then you only have two choices: prove to everyone that your power is real, or tuck your tail between your legs and disband the country. If your deterrence is not deterring, you might as well pack up and go.
The "West" went the road of the classic "Fuck around---->Find out", and it tickles me when today on TV I see media pundits outraged at how "Russian barbarians lost their cool", considering how much chestpounding they were doing a couple of days ago, when NATO allowed missile strikes on Russia.