'Nightmare scenario' confronts China as Asian aggression opens doors for U.S.

It made headlines as the likely source of the Navy’s worst COVID-19 outbreak, but the USS Theodore Roosevelt’s port call in March to Da Nang, Vietnam, may be remembered in the long run as a milestone in a major power shift in Asia.

The Roosevelt, only the second U.S. aircraft carrier to make a port call in Vietnam since the fall of Saigon in 1975, marked 25 years since the two countries normalized diplomatic relations.

But Pentagon officials and private analysts say the openness about military cooperation between the former...