The United States will also propose UN sanctions on multiple North Koreans, a day after Pyongyang carried out what it said was the launch of a hypersonic missile.
US President Joe Biden told a joint news conference with his South Korean counterpart Moon Jae-in that he had named veteran diplomat Sung Kim, the former US ambassador to Seoul, as his special envoy for North Korea.
Kim Jong-un has been formally named head of state of North Korea and commander-in-chief of the military, a move interpreted by some as a chance to project the image of the country as a normal state and the leader as the bringer of peace.
As US President Donald Trump and North Korean leader Kim Jong-un try and outdo each other with threats over Guam, what do the residents of the island feel? Is there calm or an exodus to avoid planned Pyongyang strikes? And why Guam?
As North Korea announces plans to fire missiles near Guam, Trump warns Pyongyang should be "very, very nervous" if it did anything to endanger the US or its allies.
The US military says its missile defence system and radar networks will allow it to track and destroy incoming warheads from North Korea or Iran. But a lack of real-world testing raises doubts about US missile defences.
Pyongyang says it is working on a plan to simultaneously fire four ballistic missiles in an enveloping fire around Guam, a key US military stronghold that is home to US citizens, long-range bombers, military jets and submarines.
Japanese fighters conduct joint air drills with US supersonic bombers close to the Korean peninsula as reports emerge of Pyongyang miniaturising a nuclear warhead.
Southeast Asian foreign ministers on Saturday reiterated in a joint statement their concerns over the escalation of tensions on the Korean Peninsula due to the North Korea's two ICBM tests last month, saying the launches threaten world stability.
North Korea will become the only country to which Americans are banned from travelling. The decision comes in the wake of US student Otto Warmbier's death after alleged torture in a Korean prison.
Pyongyang conducted intercontinental ballistic missiles tests on Friday to prove its ability to strike America's mainland, drawing a sharp warning from US President Donald Trump.
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