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Meanwhile, various reactions are taking place in the United States in response to the announcement. Bolton's White House security adviser says he should resume US-ROK military training immediately, and former Secretary of State Hill said he must find a diplomatic solution.

Correspondent Kim Soo-hyung reports from Washington.

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Former White House National Security Adviser Bolton insisted on resuming all US-ROK military exercises canceled or reduced on Twitter.

He also called for a congressional hearing to check to see if US troops are ready to fight tonight.

CNN fears that North Korea's new policy could bring North America back to a 2017 confrontation that threatened humiliating personnel and threatened nuclear war.

In a video interview with SBS, former US Assistant Secretary of State Christopher Hill, who has long negotiated with North Korea, stressed that solutions to North Korea must be found through international cooperation.

[Christopher Hill / Former Assistant Secretary of State for East Asia: There is no good military solution to the North Korean problem. One of the tools in the toolbox for the United States should be a diplomatic solution to working with other countries.]

US media point out that it is difficult for President Trump, who is on the verge of impeachment and re-election, to take seriously on negotiations with North Korea, which could lend the attack.

Similarly, foreign officials noted that North Korea would not want an agreement with the United States that might be reversed if the regime changes.