“Across Asia, countries and cities that seemed to have brought the coronavirus epidemic under control are suddenly tightening their borders and imposing stricter containment measures, fearful about a wave of new infections imported from elsewhere,” the New York Times reports. “The moves portend a worrisome sign for the United States, Europe and the rest of the world still battling a surging outbreak: Any country’s success with containment could be tenuous, and the world could remain on a kind of indefinite lockdown.”