Russia went into the war with armed forces that turned out as you say (possibly except the nukes, hard to tell unless they attempt to use one); the war forced them to develop substantial drone and anti-drone capabilities that the EU nations are not yet in a position to counter.
I suspect that if my country gave Putin what we give to the US - military bases where they can do whatever they please no questions asked, real-time intelligence access, unofficial favored supplier status for anything that might be control-relevant, quiet veto power over any national policy decision deemed "strategic" - then we wouldn't have to worry about invasion - from Russia anyway. Why invade what you already own?
I think that price is a little too steep, though. Not to mention that the US would then be at least as willing to topple governments/invade as Russia currently is.