The amount of money and guns that have been sent to Ukraine have been critical to its survival. They still have a functioning economy just because of all the financial aid they've received. It would obviously be better if French, British, or German troops were in Ukraine, even if they were just securing the rear areas. But the fact that no one in Europe has voluntarily joined Ukraine's war against Russia isn't comparable to putting a tripwire deterrent in place.

If the U.S. seized Nuuk, and Europe mustered a counter-invasion, it would be comparable.