Russia's invasion of Ukraine isn't "genocidal," what would be closer to genocidal is the West's intention to fight Russia to the last Ukranian standing. Several times, Russia has tried to reach a peace deal, only for the UK and US to step in and tell Ukraine not to take it. The "stealing of children" is taking orphans from warzones and making sure they don't die.

Russia's goal isn't to ethnically cleanse Ukraine, nor is it to "de-Nazify" Ukraine. Russia's goal is to totally ruin Ukraine's military capabilities as a means to prevent further extension of NATO encirclement around it's borders. This is a consequence of the 2014 Euromaidan coup, and goes all the way back to the dissolution of the USSR. When the USSR was sliced up and sold to the West for profit, 7 million people died, and a Nationalist movement led to domestic Nationalist bourgeoisie reclaiming industry from the West, beginning a long series of NATO expansion and encirclement to force Russia to open themselves up again for the West to profit.

No, Russia are not the "good guys." No Communist believes Russia has morally just intentions and is here to save everyone. Communists believe Russia is acting in its own material interests, and those interests happen to align against US-Hegemony, which Communists see as the primary block for progress.

Communists have as such advocated for both countries to negotiate a cease-fire since the beginning of the invasion. An ideal situation would be a cessation of NATO expansion and no bloodshed, but Communists have no real control over that.