From https://snyder.substack.com/p/how-does-the-russo-ukrainian-war:
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And so we can see a plausible scenario for how this war ends. War is a form of politics, and the Russian regime is altered by defeat. As Ukraine continues to win battles, one reversal is accompanied by another: the televisual yields to the real, and the Ukrainian campaign yields to a struggle for power in Russia. In such a struggle, it makes no sense to have armed allies far away in Ukraine who might be more usefully deployed in Russia: not necessarily in an armed conflict, although this cannot be ruled out entirely, but to deter others and protect oneself. For all of the actors concerned, it might be bad to lose in Ukraine, but it is worse to lose in Russia
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