North Korea launched an unidentified missile, unsuccessfully, on Sunday morning from its east coast, near Sinpo, say US military officials.
Other issues likely to be discussed include the ongoing installation of an advanced United States missile defence system on the peninsula.
"The type of missile is still being assessed", the U.S. Pacific Command says in an emailed statement.
Pence said North Korea's "provocation" was another reminder of the risks that USA and South Korean service members face every day "in the defense of the freedom of the people of South Korea and the defense of America in this part of the world".
US Vice President Mike Pence walks with Commander General Vincent K. Brooks as he arrives at Camp Bonifas near the truce village of Panmunjom, in Paju, South Korea.
The timing of the test, coinciding with Pence's trip and a day after the military parade, would suggest deliberate defiance.
Radio Pyongyang broadcast a new combination of mysterious random numbers believed to be coded orders to its spies operating in South Korea, Yonhap reported.
In his ABC interview, McMaster said that Trump had directed U.S. military, diplomatic and intelligence officials to provide him with options - in concertation with regional allies including China - that could be used "if the North Korea regime refuses to denuclearize".
That launch from the same region earlier this month came ahead of a meeting between President Trump and Chinese President Xi Jinping, a key ally of North Korea, to discuss Pyongyang's arms program.
A TV screen shows a file footage of the missile launch conducted by North Korea, at Seoul Railway Station in Seoul, South Korea, Thursday, March 10, 2016.
At a joint press conference with Pence on Monday, April 17, Hwang said: "We have agreed to further strengthen the readiness posture of [the] ROK-U.S. alliance that matches the threats posed by North Korea through a swift deployment of THAAD".
Mike Pence Describes New Strategy To Solve North Korean Nuclear Issue
North Korea and South Korea are technically still at war because their 1950-1953 conflict ended in a truce, not a treaty. He said: "We will respond to an all-out war with an all-out war and a nuclear war with our style of a nuclear attack".
More likely, if there is still going to be a test or launch created to make a political statement, it could be timed just before or after April 25 to further dilute the potential PR impact of a failure. He will also aim to reassure allies in South Korea and Japan that the US will take appropriate steps to defend them against North Korean aggression.
Han said that in the face of such actions, North Korea "will go to war if they choose".
Aside from improving the technology, North Korean missile and nuclear tests are seen by outside analysts partly as efforts to bolster the domestic image of leader Kim Jong Un and apply political pressure on Seoul and Washington.
According to the adviser, the test had been expected and the US had good intelligence both before and after the launch.
Pointing to the quarter-century since the United States first confronted North Korea over its attempts to build nuclear weapons, the vice president said a period of patience had followed.
North Korea's vice foreign minister says it will conduct its next nuclear test whenever its supreme headquarters sees fit.
Trump acknowledged on Sunday that the softer line he had taken on China's management of its currency was linked to Beijing's help on the North Korea issue.
After a two-month policy review, officials settled on a policy dubbed "maximum pressure and engagement", USA officials said Friday.
Trump tweeted Tuesday that the North was "looking for trouble" and if China didn't do its part to rein in Pyongyang's nuclear ambitions, the USA could handle it alone.
China said it cut off coal imports from North Korea in February, in accordance with U.N. Security Council sanctions.
Trump, spending the Easter weekend at his Florida resort, reinforced his commitment to the armed forces under his control.
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