"unprovoked Russian invasion"
I guess you've forgotten why, officially, russia invaded the Ukraine and where the actual war is waging. Yeah I know the western media/internet seems to only report as if Russia just invaded Ukraine over nothing and just wanting the whole of Ukraine as an expansion of Russia, but, again, OFFICIALLY, Russia invaded Ukraine because in the east 2 large populations (finally) separated themselves from Ukraine and declared their own 2 states, but the government in Kyiv said before, if that would happen they would send their army into that area. So when it happened, those two 'states' asked Russia to protect them, and Russia acknowledged the call. And the main war is still happening in that area, with bombardments of Kyiv because that's where the Ukraine high command is stationed, just like in WW2 when UK/US bombarded cities in germany far away from the actual frontline.
People seem to think it was all peaceful there before Russia 'invaded' Ukraine, but it was far from it. Since the fall of the USSR it has been a mess in that area of the Ukraine, even the downed commercial airliner MH-17 years before the 'invasion' was a result of that turmoil. Those people where more russian than Ukraine, and didn't want to be governed by the highly corrupted government in Kyiv. Let's not also forget Ukraine was known as one of the most corrupt nations of Europe.
Ofcourse Russia had ulterior motives, just like the US when they invade Iraq based on a big lie.