You don't, (Western) Europe is just a rentier-place at this point, living on other people's backs. For example look at Maersk, from the much-beloved and relaxed Denmark, their business would crumble over night if it weren't for the Americans keeping the seas open for them.
USA is the only country that ever triggered article 5 of NATO and got military help out of it. And now acts like victims when others don't rush to help them with absurd badly planned war where they are clear aggressors.
The second real use of NATO was to send armies to greenland to discourage USA to attack it just 2 months ago. So, now is really not the time for America to pretend ever do something that is not primary for itself.
That was token help (the Brits excluded), let's be serious here, we're all grown-up men.
Lets be serious here.