It's not that clear. Russia had huge stockpiles of stuff. But it's old, and much of it is in poor quality. The tech being deployed in Ukraine is very poor. We've seen WWI era rifles, almost WW2 era tanks, tanks that don't work or don't have gunners, planes without navigation. A gun is still a gun, but they also don't have as many people. The Russian army was a peacetime army. It wasn't ready for war and they've had a tough time recruiting people in the past several months. They've also drawn a hard line against recruiting from ethnic Russians in places like Moscow. The biggest conflict though is in getting the stuff to the frontlines. Their comms, intel, and logistics are pretty poor.

But they do have a lot of people, and if they're willing to let them die, it'll take a long time to get rid of them.