I would think and expect NATO will have detailed and extensive war plans for a Russian invasion of a member state, I don't agree we aren't prepared. The USAF has incredible lift capacity to move troops and equipment. We have thousands of combined fighters and bombers, we have safe air fields to accommodate B-52s across all of Europe, the US Navy could essentially guarantee the safe delivery of equipment across the Atlantic. It would be so one sided that short of nuclear weapons being used, most of us wouldn't even know we were fighting a war because there wouldn't even be a need to call up civilians. Russia would be forced to surrender within 1 month, very generously.