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.

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Moon made the remarks during a phone call with US President Donald Trump, saying it was unclear whether the North actually had the technology to miniaturise 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

US mainland witin range, in violation of UN Security Council resolutions.