Not trying to under or overestimate - just some items for consideration.
The Georgia op was carried out by mostly Russian mercenaries - battle testing new tech, if you will.
M1A1s haven’t killed a T-90 yet either - which is the point - no one knows exactly how well one or the other would do in real combat.
Don’t need GPS to point and shoot at a hot target. Russian SA and TanktoTank anti-tank missiles are optical or thermal, I believe.
Their GLOSNASS satellites, while not as optimal as the US mil GPS ones, are functional for the situation proposed. The question you may want to ask is: will Obizmo allow the Russians to build GLOSNASS monitoring stations in the US?
Fair enough, I’m not saying that Russia would be a cakewalk for NATO, but it probably wont be like facing the 1941 Wehrmacht either.