There’s a perception in the US that the European members of NATO aren’t pulling their weight, rather living comfortably with the US doing the heavy lifting.
That is more a problem of perception. A lot is done quietly from development and integration of former eastern bloc economies to developing country's aid and such. Maybe not as sexy but certainly a considerable European share already happening. It goes up to german funding US military installations in Germany like the new Landstuhl military hospital.
If NATO's east is now under fire we need to cooperate more than ever.
Time to face the realities. The Cold War is back. The US pivot to Asia contributed to this mess.