WASHINGTON - US President Donald Trump said on Thursday a major conflict with North Korea is possible in the standoff over its nuclear and missile programs, but he would prefer a diplomatic outcome to the dispute."There is a chance that we could end up having a major, major conflict with North Korea. Absolutely," Trump told Reuters in an Oval Office interview ahead of his 100th day in office on Saturday.Nonetheless, Trump said he wanted to peacefully resolve a crisis that has bedeviled multiple US presidents, a path that he and his administration are emphasizing by preparing a variety of new economic sanctions while not taking the military option off the table."We'd love to solve things diplomatically but it's very difficult," he said.Trump lavished praise on Chinese President Xi Jinping for Chinese assistance in trying to rein in North Korea. The two leaders met in Florida earlier this month.