North Korea has a habit of firing off missiles to mark major political anniversaries, or as gestures of defiance to top U.S. officials visiting the region.
He repeated US President Donald Trump's warning that the US would act without China if necessary.
A television screen broadcasting live footage of the ceremony to mark the 105th anniversary of the birth of North Korea's founder Kim Il-Sung. "The president has no further comment".
Vice President Pence landed in South Korea Sunday where he visited USA and South Korean troops.
Day one, Easter Sunday, was largely ceremonial for Pence: laying a wreath at a South Korean national cemetery, church and holiday dinner with military members and their families.
In fact, Britain could begin to demonstrate its vaunted new independence by taking a clear lead, proposing its own security council resolution demanding new UN-sponsored talks tasked with achieving a final peace agreement on the Korean peninsula. North Korea is thought to have a small arsenal of atomic bombs and an impressive array of short- and medium-range missiles.
Experts are reportedly examining footage from the parade for clues on the types of missiles North Korea might be developing - specifically long-range intercontinental missiles that could potentially reach the USA, which are the most concerning. It has said it has developed and would launch a missile that can strike the U.S. mainland, but officials and experts believe it is some time away from mastering the necessary technology, including miniaturising a nuclear warhead.
The UK Foreign Office has also responded saying it is "concerned by reports of a missile test by North Korea" and is "monitoring the situation closely".
Trump's national security team had already thought through various scenarios that North Korea might take this weekend, and how the United States would react.
According to CNN, the United States has just sent additional naval forces into the area, including the USS Carl Vinson aircraft carrier group. North Korea flaunted almost 60 missiles, including what is believed to be its new intercontinental ballistic missiles.
There is speculation that the use of the largest non-nuclear bomb in the USA arsenal was not just to send a message to ISIS, but a way to threaten Kim Jong-un. But he added the response will be different if it is a nuclear test.
Earlier this month, Trump hosted Chinese President Xi Jinping at his Mar-a-Lago resort.
I have great confidence that China will properly deal with North Korea.
Hightened tensions on Korean Peninsula following failed DPRK missile testTensions are flaring on the Korean Peninsula following the latest missile test by the Democratic People's Republic of Korea.
Raddatz asked USA military leaders in the south how the air operations center responds when North Korea shoots off a ballistic missile.