No shit, they can’t even win a war against a former client state.
I really don’t want to defend Russia here, buuut realistically Ukraine would have been defeated a while ago without the constant stream of weapons and money from the west. Yes, there would possibly be some partisan / guerilla warfare still going on, but the official military would have been defeated.
In WWI there were attempts to bring down early tanks with heavy machine guns (the armor was not that thick back then)… but i am not sure if this is an official category.