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.
As a Christian ML/Juche student, I would actually argue that morality is real, and discoverable philosophically, but that its realization in the material world is always dependent on particular historical circumstances. Moral action is the domain of the subject; but humanity, even in socialist countries, is still largely the object of history. Thus, for now, the field of moral action is the field of subjectivity: the individual, and those close to them. It is thus not helpful, at this stage of historical-material development, to view politics through a moral lens.