the Europeans have only ever purchased American products because they were cheaper by the feature, and there wasn't a political constituency to placate (see the [wine lake|wikipedia]). and the US in return.

as it was, so shall it always be.

any appetite to flush money down the drain because Greenland feels insulted will dull very very quickly. However as defense treaties have always been more fleeting than NATO has been, we can be sure the Europeans will quickly find better, more reliable partners than they've had in the US, no doubt at lower cost for all concerned.