Russia's invasion of Ukraine is a shocking and generation-defining failure

Militarily, Russia is doing very well. They have defeated much of the Ukrainian army, and have occupied large parts of the country. Politically, though, their reputation has taken a hit. The Russophobic propaganda campaign is making them look bad.

Russia's impending economic collapse

They aren't going to collapse from the sanctions, dude. China and India are still doing business with Russia, and exchanging oil, metals, grain, etc. They are even setting up their own banking system that is outside of SWIFT, to continue free trade.

this probably means the final and definitive break between Russians and Ukrainians

The Russians have been very careful to limit collateral damage among civilians, which is difficult because the Ukrainian army is fighting within the citys and essentially using their people as human shields. Thats the only reason why the fighting is still going on. Russia has total control of the countryside, and complete freedom of maneuver, aside from the occasional partisan attacks.