The Russian armed forces have been taking Soviet-era arms out of storage as a solution to its dwindling supply of weapons despite these reserves being limited.
As Russian arms stores decrease, Russia could finally be defeated in the war in the foreseeable future if the West commits to continued and scaled military assistance to Ukraine.
Perun talked about that two weeks ago (https://youtu.be/nQLI8xnINqk?si=fh-d-WXtQAEBXsi7, 64min).
If I remember correctly, the gist is that Russia can keep this up for a while, but the quality of the equipment is going down, not up. And in two years or so they will run out.
And here is another related video (https://youtu.be/bJK5NYxGNOQ?si=z_8zYB0bMqqsxD0Y, 11min).
Basically the same message. Russia is at an advantage right now, but the West can catch up, if we want to.