Friends in need: U.S.–South Korean joint military drills in South Korea, March 2016
Kim Hong-Ji / Reuters

In his three years in office, U.S. President Donald Trump has aimed his trademark vitriol at a wide range of targets, both foreign and domestic. Perhaps the most consequential of these is the United States’ 70-year-old alliance system. The 45th president has balked at upholding the country’s NATO commitments, demanded massive increases in defense spending from such long-standing allies as Japan and South Korea, and suggested that underpaying allies should be left to fight their own wars with shared adversaries. Trump’s ire has been so relentless and damaging that U.S. allies in Asia and Europe now

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