It’s tempting to declare this “imperialist war” or “no support to capitalist Russia” or whatever to maintain ideological purity, but that is just avoidance of problem. This is the problem all ML leaders did faced too, some highlight include: Mao and his concept of just war, Stalin and his famous explanation of what revolutionary and reactionary means in the context of imperialist international politics, Che with realisation that USA is the biggest enemy in the world, and even Lenin, so often quoted in this situation out of context, had no problem in supporting clearly imperialist Japan when the opponent was worse.