U.S. soldiers participate in a multinational exercise at a naval base in San Antonio, Zambales, Philippines, on April 28, 2026. —Daniel Ceng-Anadolu via Getty ImagesThese are not easy days for America’s allies. From Europe to the Middle East to the Asia-Pacific, security partners of the United States are treading carefully, fearful of antagonizing President Donald Trump, who has cast Washington’s closest allies as freeloaders, slapped them with …