Not 3. 1 country in Africa sided with Russia, about half abstained, and the other half voted to condemn Russia. Almost all of South America and central America voted to condemn. Most of the middle-east, southeast Asia, most of the Oceanic nations. But sure, half the world sided with Russia, if you count the peasant farmers in India and China who don't even know what year it is.
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Executing prisoners under some absurd pretense of war crimes won't save them from the angry Ukrainians who have no reason not to fully crush the shitball "republics" in Donbas and re-take Crimea like they could've at any point between 2014 and the start of the invasion.