Japan’s Cabinet Secretary Yoshihide Suga said the move would need to be dealt with in a serious manner, also noting that it was a breach of previous North Korean commitments.
U.N. Secretary-General Ban Ki-moon, who is South Korean said he was “deeply troubled” by the news, CNN reported.
“The current crisis has already gone too far,” Mr. Ban said in a statement from Andorra. “Nuclear threats are not a game. Aggressive rhetoric and military posturing only result in counter-actions, and fuel fear and instability.
“Things must begin to calm down, as this situation, made worse by the lack of communication, could lead down a path that nobody should want to follow.”
In Beijing, the spokesman for the Foreign Ministry, Hong Lei, said that China, the North’s only major-nation ally and largest trading partner, was “regretful” about the news.
“We have noticed the statement made by the DPRK and feel regretful about it,” Mr. Hong told a daily briefing for reporters, according to the New York Times. China urged “all parties to remain calm and restrained,” he said.