The story so far...
1) Russia has no air superiority over Ukraine
2) Russia's Black Sea Fleet has scurried away from Crimea, since they cannot stop attacks from Ukraine, a country with no navy.
3) The US estimates that Russia has lost about 90% of its prewar forces. Russia is now refurbishing 60 year old tanks for use in Ukraine - tanks that were declared obsolete in 1975. Their forces are so fully committed to the front that Wagner, a rebel faction, got halfway to Moscow unopposed.
4) Russian weapons have proven to be Potemkin frauds - from the vaunted Kinzhal missles to the "terminator" fighting vehicle. Relics from the Western inventory - some of them more than 30 years old like the Patriot system, Stinger missile and Gepard tanks - have shown to be more than capable of handling the latest Russian equipment.
But on the other hand, Russia's extensive defences have held back Ukrainian progress. Gains or losses are meager.