SEOUL (Reuters) - South Korea s President Moon Jae-in said on Thursday a missile launched this week by North Korea was the most advanced of Pyongyang s arsenal, but said that the isolated state still needed to prove some technical details. Moon made the remarks during a phone call with U.S. President Donald Trump, saying it was unclear whether the North actually had the technology to miniaturize a nuclear warhead and that it still needed to prove other things, such as its re-entry technology. Earlier, the United States warned North Korea s leadership it would be  utterly destroyed  if war were to break out, after Pyongyang test-fired its most advanced missile, putting the U.S. mainland within range, in violation of U.N. Security Council resolutions. 
North Korea's missile is advanced, but still some things to prove: South Korea president