If Kursk appears not to be covered by the Russian nuclear umbrella in practice, what realistically will cause any country to fire off nuclear missiles? Existen

If Kursk appears not to be covered by the Russian nuclear umbrella in practice, what realistically will cause any country to fire off nuclear missiles? Existential threat. An attack like Prigozhin's mutiny; an overwhelming force approaching Moscow, with nothing in the way to stop them. This is a realistic scenario where nuclear weapons could be launched as a final "fuck you". Ukraine was in this kind of final stand when Russian forces were on the outskirts of Kyiv, an attack on the city was expected at any moment, and soldiers were handing out guns and ammo from dump trucks to anyone who wanted them. This is the moment to launch nuclear weapons, if you have any. The final, desperate moment before being overrun. Kursk is nothing of the sort. Russia attacked Ukraine, Ukraine countered, and pushed Russian forces back by 10 miles into Russian territory - so what? Trying to spin this as a "land invasion of Russia" is ridiculous hyperbole that even Russian military experts don't take seriously. I distinctly remember one of them demonstratively rolling his eyes and sighing when Solovyov tried to push the same narrative with leading questions on his show.