It was started when the US instigated a coup in the Ukraine, it blew up in their face when the people of Donbass rose in revolt. Then US tries to pretend that Russia somehow had anything to do with it.
Let me repeat: the US instigated a coup in the Ukraine. Everything that has happened since, including this Russian invasion, is fallout from that. So it's not as though the Ukrainians were just minding their own business when Russia suddenly decided to invade. It's still an open question as to whether it is good move on Russia's part - we'll see how it plays out. But at worst, it is an understandable response to a genuine threat.
But for me, the reason why I prefer so see Russia succeed here is because Russia is needed to but a check on Washington's hegemony, which engages in military operations half a world away whenever there are political trends that it has an ideological issue with. Russia, on the other hand, only uses military force in response to direct threats to Russian interests. But go on, tell me more about Russia is "the clear aggressor".