America’s NATO allies, already dealing with an aggressive Russia, the rise of nativist populism and the possible effects of Brexit, became even more worried this week when they read Donald J. Trump say that the United States might not come to the defense of NATO allies that do not foot their share of joint-defense bills as mandated by agreements but often ignored by European governments.
American officials have pressed European countries in recent years to increase military spending in line with their commitments to NATO, but Mr. Trump much more explicitly has linked financial considerations to the strategic response he would order as president in the event of an attack by Russia.
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