Government spokesman Yoshihide Suga said at a press conference that the Japanese authorities were monitoring the situation closely, and described the North Korean regime's threat as unacceptable, reports Efe news.
Meeting with South Korean President Moon Jae-in on Thursday, Trump doubled-down and moved to impose further sanctions against North Korea, on top of the UN Security Council's recent sanctions.
McKinney, a retired Army colonel who spent more than 40 years working on US-Korea military planning, said he was more concerned that North Korea may test-fire a missile toward Guam, a US territory in the Pacific.
The fresh round of personal insults began earlier this week when Trump dubbed Kim "Rocket Man" on Sunday and again used the moniker at the United Nations, saying Kim is "on a suicide mission for himself".
The latest insults between Trump and Kim come as Trump expands the Treasury Department's ability to target anyone conducting significant trade in goods, services or technology with North Korea and to ban them from the USA financial system. Trump said he would "totally destroy" the North if necessary in his speech to the world body Tuesday. Kim Jong-un said the U.S. president will "pay dearly" for his threat.
The word appeared twice in a statement by the North Korean despot, who was lashing out against the speech that Trump made at the United Nations General Assembly, in which he threatened to "totally destroy" the hermit nation.
"If China doesn't crackdown brutally hard on North Korea's economy, mercilessly hard, this is going to end in war", he said.
The Trump staffer said although the administration recognises "a certain amount of bluster" coming from Pyongyang, the USA was taking the threat seriously.
North Korea's six previous nuclear tests have all been conducted underground.
CHANG: Kim lectured the US president, calling his behavior mentally deranged.
"All relevant parties should exercise restraint instead of provoking each other", he said.
Wang said that the situation of North Korea is of utmost importance and is of common concern among the United Nations member countries.
After all, the North Korean ambassador left even before the US President began his speech.