As NATO leaders gather in Brussels, U.S. President Joe Biden’s “America is Back” approach is expected to revive the alliance former U.S. President Donald Trump had dismissed as “obsolete” and demoralized by demanding members fulfill their never- hitherto-enforced obligation to spend 2 percent of GDP on defense, even upping the demand to 4 percent. About then, French President Emmanuel Macron also proclaimed the alliance “brain dead.”