The attack on Kuwait, which the U.S. Central Command said happened late Wednesday night, was the latest flare-up to shake the fragile ceasefire. WASHINGTON — The U.S. military on Thursday slammed Iran for violating a fragile ceasefire after Kuwait reported coming under attack in the latest flare-up that threatened ongoing negotiations to end the war. U.S. Central Command said that Kuwait had intercepted missiles launched by Iran late Wednesday night, calling the Iranian attack on one of America’s top allies in the Persian Gulf an “egregious ceasefire violation.” Kuwait had earlier announced an attack on its territory, and Iran said…