Meanwhile, Guam has posted emergency guidelines to help residents prepare for any potential nuclear attack as North Korea threatens to fire missiles at the US Pacific territory.
"On the North Korean side", he says, "there are differences of specificity".
The newspaper said USA intelligence officials have assessed that a decade after North Korea's first nuclear test explosion, Pyongyang has produced nuclear weapons for ballistic missile delivery, including by intercontinental missiles - the type capable of reaching the continental US.
But Trump said Friday that millions of Americans support their president "sticking up" for the US and its allies.
"For me because I'm a father, so it's really concerning, you know, I wish it didn't have to come to that", he said. "And there are cases where they (have) made a specific threat and carried it out".
Japan's Chief Cabinet Secretary Yoshihide Suga said that it's very important to secure USA deterrence at times when regional security is at stake.
Military solutions are now fully in place, locked and loaded, should North Korea act unwisely.
Experts in South Korea said the plans unveiled by the reclusive North ratcheted up risks significantly, since Washington was likely to view any missile aimed at its territory as a provocation, even if launched as a test.
But privately some Cheong Wa Dae officials admit they are anxious about the increasingly inflamed rhetoric between the US and North Korea.
"A vacuum in diplomacy leads to a vacuum in national security", he said.
He added that the military offered an extra reassurance.
US President Donald Trump (L) and Chinese President Xi Jinping (R) walk together at the Mar-a-Lago estate in West Palm Beach, Florida, April 7, 2017.
The North's missile and nuclear programs have been shrouded in secrecy for years, but recent tests have shed more light on their capabilities. The report with the same headline was published by the Korea Times. When news broke of North Korea's threat broke, he says he was distraught.
The U.S., China and Russian Federation need to come together to force the North to de-escalate, he said.
"China calls for all related parties to insist on moving in the direction of resolving the nuclear issue on the Korean Peninsula through political means", the ministry said.
The diplomatic move came hours after Pyongyang raised the stakes by announcing it was "seriously examining" a plan to "interdict" U.S. forces based in the Pacific territory of Guam with four ballistic missile strikes nearby.
While some people are dismissing the seriousness of the conflict, officials in Guam are not taking the threat lightly.
He spoke as Pyongyang accused him of "driving" the Korean peninsula to the "brink of a nuclear war". "It's time to tone down the rhetoric".
North Korea first fired a missile over Japan in 1998, prompting the Japanese government to to initiate its current ballistic missile-defense system with the U.S. While a second attempt failed in 2005, North Korea again succeeded in launchingone in 2009 that flew over northern Japan and continued for another 3,000 kilometers before landing in the Pacific. "Why did Guam just pop up - like North Korea is going to be bombing?"
HU:.There's a certain island calm about the war of words between Washington and Pyongyang.