The US literally just lost the war in Iran. I don't think they're actually capable of "stomping" on anyone.
All of Europe can't even push back a broken husk of Russia.
Of course if the Russians make it to the German border AfD will welcome them with open arms and the rest of the German public will be too busy debating if raising the debt limit to dig their own graves is acceptable if it means limiting pensions, and if so, what are acceptable working hours for grave diggers, pension plans for grave diggers, and whom should negotiate on behalf of the grave diggers.