I seem to recall that we drove them into those caves. No military is made for endless occupation and ceaseless insurgent guerilla warfare. When we've sent our boys in en masse, we generally are quite effective at taking territory.
Strange echoes of the thirties. We had our near miss with a depression in '08, followed by a decade of growing civil discord all over the world. Now, possibly, a major war. Let's hope not.
IMO, this is where you need leaders with real backbone. Putin senses weakness in the West. They've been appeasing and appealing to diplomacy and instituting weak sanctions. Guys like Putin only respect force.
Possible, but I doubt anybody alive in the Boston area will see 90" in three weeks again. The return rate for something like that has to be astronomical.