Former defense officials and experts say any new military conflict with North Korea would likely escalate quickly to the use of nuclear weapons, bringing catastrophic casualties not seen since World War Two and an untold economic impact worldwide.
"North Korea should realise if it doesn't stop its nuclear, missile provocations it will face even stronger pressure and sanctions", Defence Ministry spokesman Moon Sang-gyun told a regular news briefing.
The warhead breakthrough is considered a crucial advancement on the path to producing a nuclear weapon capable of striking the US mainland, experts said. It was a question driving the hallway chatter at the gathering, but the USA shot down that prospect and said Tillerson had no plans to interact with Ri.
Tillerson aide R.C. Hammond said that after a productive first day, Tillerson spent several hours preparing for Day 2.
"It will be a war more serious in terms of human suffering than anything we've seen since 1953", Defense Secretary Jim Mattis said earlier this year.
The North Korean regime said it is rushing to develop nuclear missiles to deter the US from an attack. "It will involve the massive shelling of an ally's capital, which is one of the most densely packed cities on earth".
In Manila, Tillerson said he hoped the North would "choose a different pathway and when the conditions are right, that we can sit and have a dialogue". "None of them are good". North Korea must halt its missile tests, but the top United States diplomat left out any stipulation on nuclear testing. The State Department declined to comment citing "intelligence matters".
Guam, a tropical island more than 3,000 km (2,000 miles) to the southeast of North Korea, is home to about 163,000 people.
North Korea, meanwhile, threatened a "thousands-fold" act of revenge against the U.S. on Monday for the United Nations sanctions passed Saturday, the Associated Press reported.
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Trump has threatened to impose punitive trade restrictions on China for its alleged trade abuses, and has delayed actions to impose broad restrictions on steel imports. That came a day after China and Russian Federation joined with the United States in a unanimous U.N. Security Council vote approving the toughest economic sanctions yet against the increasingly isolated regime. But there were no signs the USA would acquiesce to China's call for a quick return to negotiations.
China, North Korea's economic lifeline, said it is fully committed to enforcing the United Nations sanctions meant to deprive North Korea of $1 billion in annual export money Pyongyang is using to fuel its illicit nuclear and ballistic missile program.
North Korea's response to the United Nations sanctions came as U.S. Secretary of State Rex Tillerson said the best step Pyongyang could take to signal it is ready for dialogue would be to halt its missile tests. North Korea will continue to test additional ballistic missiles and potentially even a thermonuclear weapon soon.
However, Cayetano mentioned that it was a deadlock for ASEAN to be a peacemaker at this time as North Korea refused to put into the negotiating table its nuclear program.
"Today's news makes clear that much more than these sanctions is required to protect US interests", said Jay Lefkowitz, a former USA special envoy on human rights in North Korea.
Yet already, there are signs that nations with the strongest ties to North Korea may fall short of the stringent enforcement that Trump and others seek.
Whether China really expects the USA and the Koreas to "do their parts" is doubtful.
The question of whether Beijing would go along with much harsher sanctions against North Korea was answered this weekend.
"If they don't, we will wake up one morning and discover North Korea has tested a hydrogen bomb or a three-stage ICBM - and that could hit ALL of the USA homeland".