London CNN  —  The Trump administration has sent an unmistakable message to Europe: You’re on your own. In three dizzying months , the White House has reversed decades’ worth of American foreign policy, pledged to scale back its presence on the continent, and pushed to wrap up Russia’s war in Ukraine, even if that might mean handing Ukrainian land to Moscow. The new reality is one to which Europe is still adjusting. But 80 years to the week after American and European allies forced the