Make them pay, at the very least, or threaten and be prepared to walk out of NATO.
I had both accompanied and unaccompanied tours in regions of US interest throughout my time in the military.
One thing that always struck me was how SMALL the armed forces of those allies were, and how much WE did just about everything, paid for everything, and even paid THEM to participate in their own defense.
I think every Soldier, Sailor, Airman, or Marine knows that even BEFORE the wall fell that NATO was the US + a paper tiger.