Analysts warn that even failed missile launches provide valuable knowledge to North Korea as it tries to build its weapons program.
Pence arrived in South Korea on Sunday to kick off his Asia trip, hours after North Korea launched the missile off its east coast.
Meanwhile, US Defence Secretary Jim Mattis has said that President Donald Trump and his military team are aware of the missile launch. "The type of missile is still being assessed", the US Pacific Command (USPACOM) said in a statement. A North Korean missile exploded during launch Sunday from the country's east coast, USA and South Korean officials said, a high-profile failure that comes as a powerful US aircraft carrier approaches the Korean Peninsula in a show of force.
The event saw thousands of North Korean troops, along with the country's arsenal of missiles, being paraded down the Kim Il-sung square.
Trump has suggested the USA will take a tougher stance against North Korea, telling reporters last week: "North Korea is a problem".
As concern about the situation mounted, The Sunday Times reported that President Trump's military advisers have assured the United Kingdom that America has the capability to neutralise North Korea's nuclear programme using conventional weapons.
Last August a submarine-launched ballistic missile tested from Sinpo flew 500 kilometres (300 miles) towards Japan.
Pence will land in Seoul the day after North Korea's biggest national day, the "Day of the Sun".
Just as Vice President Mike Pence took off for South Korea late Saturday, Kim Jong Un's regime in neighboring North Korea test-fired a new missile.
19-year-old dies after I-10 motorcycle crash
Highway 17 exit, when he drove out of the far left lane and struck a concrete barrier and a light pole, officials said. The man was driving his motorcycle westbound on Interstate 10 just after 5 p.m., approaching the U.S.
In the past few days the White House has completed a two-month review of its North Korea strategy, which officials summarised as "maximum pressure and engagement". Along with the military parade through the capital Pyongyang, fireworks were expected.
China banned imports of North Korean coal on February 26, cutting off its most important export.
According to the adviser, the test had been expected and the USA had good intelligence both before and after the launch.
Pence expects to talk about the "belligerence" of North Korea at stops in Tokyo, Jakarta and Sydney, the White House adviser said.
Satellite photographs suggest North Korea may be in the final stages of preparing to test another nuclear weapon.
Pence, addressing an Easter service with American troops in South Korea, said the USA commitment to South Korea was unwavering.
Korean People's Army (KPA) soldiers watch a military parade marking the 105th anniversary of the birth of late North Korean leader Kim Il-Sung, in Pyongyang on Saturday.
The officials added that they were carrying out further investigations of the incident.
They also discussed the implementation of agreements reached by the two countries' presidents during their first meeting in Florida, Xinhua reported.
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