Europe is taking a big step toward a new normality as many countries open up their borders to fellow Europeans after three months of coronavirus closures . But even though Europeans love their summer vacations, it’s not clear how many are ready to use their rediscovered freedom to travel.

German Chancellor Angela Merkel drew lengthy applause Saturday for her spirited defense of a multilateral approach to global affairs and support for Europe’s decision to stand by a nuclear deal with Iran. U.S. Vice President Mike Pence was not among the impressed, however, and he doubled down on American criticism of Europe. Merkel’s comments at the Munich Security Conference, an...