The U.S. is no longer a dependable ally. The other members of the alliance must rise to the challenge.

Has Trump put an end to NATO’s collective defense commitment? Not officially, but U.S. allies don’t seem confident the president will have their backs.

Vice Adm. Shoshana Chatfield was fired amid a broader purge of senior military leaders in the Trump Administration.

Rubio’s NATO visit aimed to reassure allies as Trump’s trade war, Ukraine policy, and defense demands strained U.S.-Europe ...