I think it’s important to understand that Marxist-Leninists should be supporting the people of both countries, rather than picking one of two capitalist states to back. I understand that Russia has its excuses for doing this, and the Ukraine government has its excuses for what it has done, but it’s important to remember that they are both capitalist countries in the age of imperialism; what they are really after is power. Please feel free to correct me if you believe I got anything wrong.
It should go without saying that all capitalist governments should eventually be dissolved, but that doesn’t mean it is best to fight all of them at the same time no matter the circumstances. Sometimes it might be better to have hired thug with you who is a bit shady and untrustworthy but knows how to fight, then a best friend that is scrawny and essentially useless. If Russia were to have an attempted communist insurrection now, their army, economy and pool of talented personnel would suffer massively and would essentially give NATO a free pass to move in and conquer Russia. The West did exactly this to Syria where they armed Anti-Assad leftist along with ISIS with the intent of weakening and fracturing Syria as whole.
Exactly, russia having an communist insurgence right now would be no different them the anarchist insurgence in the spanish civil war, it would be just useless infighting that would give fascists an free card to do what they want.