BRUSSELS — NATO Secretary-General Mark Rutte has weathered a fresh ordeal with President Donald Trump, this time over the U.S.-Israel war on Iran, a conflict that does not even involve the world’s biggest military alliance and one it was never consulted about.

Since launching the war, Trump has derided U.S. allies as “cowards,” slammed NATO as “a paper tiger” and compared U.K. Prime Minister Keir Starmer to Neville Chamberlain, who is probably best remembered for a policy of appeasement toward Nazi Germany.