Meanwhile, North Korea said on Saturday that almost 3.5 million workers, party members and soldiers volunteered to join or rejoin its army to resist new U.N. sanctions and to fight against the United States in the current geopolitical tension between Pyongyang and Washington.
Central Intelligence Agency director Mike Pompeo has offered assurances there is "nothing imminent" in the U.S. standoff with nuclear-armed North Korea, but said he will not be surprised if Pyongyang conducts another missile test.
North Korea, according to the director, has been moving at an "ever alarming rate" to develop nuclear-tipped ballistic missiles.
But he rejected talk of the United States being on the "cusp of nuclear war".
Pompeo also said the intelligence community was not surprised by the recent news that North Korea is now capable of fitting a nuclear warhead on a missile.
Asked how anxious people should be, Mr Pompeo told Fox News Sunday: "Nothing imminent". "He conducted two in July, so it wouldn't surprise me if there was another missile test".
US President Donald Trump has made clear how the US will respond to North Korea's provocations, and hopefully, the regime will understand, Pompeo added.
North Korea, for its part, threatened to shoot four missiles towards the island of Guam, a strategic outpost of the u.s. forces in the Pacific, where are stationed about 6,000 american soldiers.
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CIA Director Mike Pompeo.
But he stressed the USA is pursuing "a very determined diplomatic effort" led by Secretary of State Rex Tillerson that is coupled with new financial sanctions to dissuade North Korean leader Kim Jong Un from further provocations.
The CIA chief described Mr Kim as "rational" and responsive to "adverse circumstances".
"We're all looking to get out of this situation without a war", he added.
"Our response is we are prepared militarily to deal with this if necessary". "But make no mistake about it, the continuation - the increased chance that there will be a nuclear missile in Denver - is a very serious threat".
Friday: The US president warns that military solutions are "locked and loaded" should North Korea "act unwisely".
"The United States military is always locked and loaded", he said.