I'd expect them to find an alternative to engaging in a major urban firefight with the Russian military. If that means capitulating and facing the imposition of a foreign dictator so be it. Especially since that will be the likely result in the end anyway.
It's easy to advocate martyring people, especially if it's from afar, but what are the realistic outcomes people expect from continuing to fight in this manner? What would be a, for the lack of a better word, 'satisfactory' outcome and the odds of actually achieving it vs potential consequences?