The basic premise of nuclear safety is mutually assured destruction. If Russia believes that another superpower believes that Russia might be less capable of MAD due to losing a huge chunk of one leg of the nuclear trifecta they might be more likely to act premptively in launching a nuclear exchange.
Also, The Russian government relies on projection of an image of strength not just externally, but internally as well. If the Russian government is seen as weak internally they might be more likely to take drastic actions to stay in power.
Put all these together, and it seems like the world might just be a bit more dangerous today than it was yesterday. Maybe that is the Ukrainian strategy - make Russia do something monstrous to a western power to force western action.
Also, The Russian government relies on projection of an image of strength not just externally, but internally as well. If the Russian government is seen as weak internally they might be more likely to take drastic actions to stay in power.
Put all these together, and it seems like the world might just be a bit more dangerous today than it was yesterday. Maybe that is the Ukrainian strategy - make Russia do something monstrous to a western power to force western action.