"We'll be conducting more missile tests on a weekly, monthly and yearly basis", Vice Foreign Minister Han Song-Ryol said.
Pence is due in Seoul at the start of a 10-day trip to Asia in what his aides said was a sign of the USA commitment to its ally in the face of rising tension over North Korea.
"President Trump placed the challenge presented by North Korea as both more immediate and more strategically significant for the United States in his discussion with China's president", Yates said.
Pence, whose father is a Korean War veteran, earlier visited the Demilitarized Zone between the Koreas, where he could see North Korean soldiers across the divide.
Wit, who has recently met with North Korean officials, adds: "I think we should not underestimate North Korea's resolve to resist pressure from the United States".
North Korean leader Kim Jong Un looks at a rocket warhead tip after a simulated test of atmospheric re-entry of a ballistic missile, at an unidentified location in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang on March 15, 2016.
The North Korean government flaunts an increasingly sophisticated arsenal of intercontinental missiles and launches a midrange version, which apparently fails seconds after takeoff.
The Trump administration is focusing its North Korea strategy on tougher economic sanctions, possibly including an oil embargo, a global ban on its airline, intercepting cargo ships and punishing Chinese banks doing business with Pyongyang, Reuters reported last week, citing us officials.
Pyongyang has carried out missile and nuclear tests in defiance of United Nations sanctions, and has been working to develop a nuclear-topped missile that could strike the USA mainland, although US officials say this capability is still several years away. The U.S. and South Korea also have been conducting their annual joint military exercises, a massive operation involving hundreds of thousands of troops.
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The United States, its allies and China are working together on a range of responses to North Korea's latest failed ballistic missile test, Trump's national security adviser said on Sunday, citing what he called an worldwide consensus to act.
Trump himself appeared to reinforce the message at the White House, replying "Gotta behave" when a CNN reporter asked what message he had for North Korean leader Kin Jong Un. The 38th parallel was the border between North and South Korea before the Korean War in the 1950s. Though Russia critics welcomed Trump's newly hardened tone, there's less enthusiasm from America's allies in Asia, who fear the USA could overlook China's more aggressive posture toward its neighbors.
Meanwhile, Japan's Prime Minister Shinzo Abe reiterated his believe that pressure, not only dialogue, is necessary in dealing with North Korea's missile and nuclear threat.
The US Vice-President will leave for Japan on Tuesday. This means that ballistic missile launched by submarines from the East or Yellow seas, may easily cover a THAAD system looking at North Korea.
Lavrov said Russian Federation considers the North Korea missile testing unacceptable, but not a signal for other nations to "violate worldwide law in response and use military force". But Pence expressed impatience with the unwillingness of the North to move toward ridding itself of nuclear weapons and ballistic missiles.
He also reaffirmed that the allies will continue to delay a US missile defense system, stressing the "defensive measure" is "called for by and called for the alliance".
During his visit, Pence will also stop in Tokyo, Jakarta, Sydney and Hawaii.
And earlier this month, the United States launched 59 Tomahawk missiles on the Shayrat airbase in Syria purportedly in response to a chemical attack that killed at least 90 people two days earlier.