That's a very passive voice way to talk about the United States attacking a NATO ally in order to steal their territory. The US committing an act of war against NATO should end NATO if the treaty is worth anything at all.
This type of thing should realistically end the United States. The country does not deserve to wield this amount of global power if it's going to engage in thug behavior.
They obviously could not go to war with the US and would instead dissolve NATO.
In this case, the proposed alternative is not do nothing. It's re-center NATO around European norms, goals and behaviours. Implicitly also a call for European NATO budgets to increase significantly, which Spain (for example) refused to do and which some European and wider partners have said MUST but.. have failed to do.
Also until recently the US government wanted that increase in spending too. Admittedly to buy US materiels but that's a detail in some ways.
He wants this. There is no imperative beyond OR ELSE.. outcomes.