@Novichok
Because arguing for the need of a military-industrial complex which America has and does not need at present that much (because nobody is able to compete with it in any serious manner)
Is a way for the military industrial complex to legitimately continue to exist. You are pushing for their narrative, for Europe to spend more money on their army (preferably importing U.S weapons). Then for the federal government to spend their money more on ways of repression or pleasing American society at large (or their biggest backers).
Their argument is: "spend more money or we will withdraw from Europe. We withdrew from Afghanistan, we can pull out of anywhere else too"
Russia to successfully take over Europe is not likely even without U.S.A due to France and U.K have built up their armies, air forces and fleets after their economic troubles in 1945. Not to mention the collection of other militaries in Europe (including Finland and Sweden who have long standing traditions for winter warfare and logistics in colder climates.)
Even after a successful military offensive and conquest, Russian Federation does not have the state capacity to control or repress Europe as a whole in any ways. The amount of Russian men fleeing Russia to avoid mobilisation is a clear indicator of how much success Russian beaureucracy would have in Europe if it fails that much on their own home turf.