Based on conventional warfare Russia is doing a mighty fine job. Not only is the Ukraine army pretty much destroyed down to the last driving Lada, but Nato as well. You think these countries have plenty of well maintained, modernized weapon systems with spare parts and ammunition within the expiration date?
Again, a few dozen tanks are nothing. The front is huge and those tanks face artillery that made the land at night look like you landed on the moon, Russian tanks are scanning the horizon with modern optics, UAVs in the air expose your position, and even if you pass all of that some guy waiting with an ATGM will take care of you.
Western economy is in shambles and not on a similar industrial military scale and needs basically a year to just build one system.
One thing is for sure. The concept of NATO, being able to defend, has failed completely.