"The two leaders agreed to strengthen our alliance through defense cooperation and to strengthen South Korea's defense capabilities". It adjusted the magnitude to 5.7. The test was substantially larger than previous ones, generating a 6.3 magnitude earth tremor according to U.S. monitors.
In another tweet he said North Korea's "words and actions continue to be very hostile and unsafe to the United States" and the regime "has become a great threat and embarrassment to China, which is trying to help but with little success".
The U.S. State Department had no immediate reaction.
The latest launch of North Korea's medium-range missile was unanimously condemned by the UN Security Council (UNSC). "If you don't like the USA military involvement in that region, if you don't like the alliance that's been presented in the region - between Japan, the Republic of Korea and the US - then do something about it because, you're the trading partner with North Korea with 90 percent of the trade".
"I discussed the serious and grave threat these unsafe and illegal actions present with President Abe in Japan this week and reiterate the call we jointly made for tougher action, including increasing the pace of implementation of existing sanctions and looking urgently in the UN Security Council at new measures".
During the meeting in Camp Smith in Halawa, Harris promised to further consider possible military options against Pyongyang, should the US and South Korea decide to retaliate against any further provocations from the North.
Pyongyang has also threatened to fire rockets towards the US Pacific territory of Guam. Indeed, Japan's Prime Minister, Shinzo Abe, called the launch the "most serious and grave ever" that the country has faced.
The agency described the warhead as a "thermonuclear hydrogen bomb" with an adjustable explosive capacity of hundreds of kilotons. That could be hard to independently confirm. The Japanese leader also said he has ordered relevant ministries to gather and analyze information and inform the public appropriately. The blast is the most powerful to date and caused a significant quake. The pause in tests "certainly demonstrated some level of restraint that we have not seen in the past", Tillerson said.
North Korea has been test-firing missiles at a rapid pace all year. It conducted its most provocative launch yet last month, in response to ongoing U.S. "It is a real situation that directly bears on the security of the people on the peninsula and the whole regional peace and tranquility", she said. For context, the bomb dropped on Hiroshima by the US had a 15-kiloton yield. He said sanctions did not appear to have slowed the advance of North Korea's nuclear program, 'but I don't think harsh rhetoric does either'.
Its recent activity has been especially bold. The U.S. and South Korean aircraft then flew across the Korean Peninsula and practiced attack capabilities by releasing live weapons at the Pilsung Range training area before returning to their respective home stations.
He has been openly threatening to launch missiles at military bases on the USA island of Guam.
For its part, the White House said in a statement that Trump and Moon spoke on the phone Friday about North Korean's "continued destabilizing and escalatory behavior". Further economic and trade sanctions, increased diplomatic pressure and boosting military maneuvers or shows of force would likely all be on the table.
That yield would be roughly ten times more powerful than North Korea's previous test in 2016 and would mark a significant step forward in the North's quest for a viable nuclear missile capable of striking anywhere in the U.S.
By employing military force against North Korea, but in a proportionate way, Trump would bring that nation and its Chinese patron down to earth and puncture the myth that his threat to use force is a bluff. State media reported that the test left no trace of radioactive material.
The North's leader Kim Jong Un ordered the missile drill to be conducted for the first time from its capital, Pyongyang, and said it was necessary to undertake more exercises with the Pacific as the target, the North's KCNA news agency said.