He said the U.S. would stand by its "iron-clad alliance" with South Korea and was seeking peace through strength.
Mr Pence arrived in South Korea amid claims that Sunday's missile test might have been thwarted by a cyber attack by the United States, and warnings from Donald Trump's chief security adviser that tensions on the Korean peninsula were "coming to a head".
U.S. Vice President Mike Pence was briefed on the failed launch and had been in touch with President Donald Trump, White House aides said.
U.S. Vice President Mike Pence, center, arrives at Camp Bonifas outside of the Demilitarized Zone near the border village of Panmunjom in Paju, South Korea, Monday.
If Sunday's missile launch leads to a nuclear test or an ICBM launch, there would be "a powerful punishing measure that North Korean authority can't endure", South Korean officials said.
But Pence and Hwang said they were troubled by retaliatory economic moves by China against the deployment in South Korea of a US anti-missile system known as the Terminal High Altitude Area Defense (THAAD).
Trump's national security adviser, H.R. McMaster, indicated on Sunday that Trump was not considering military action against North Korea for now, even as a nuclear-powered aircraft carrier strike group was heading for the region.
Pence told reporters that the North Korean people and military "should not mistake the resolve of the United States of America to stand with our allies", calling the alliance "iron-clad".
The visit comes after a huge military parade during which North Korea showcased apparent intercontinental ballistic missiles, and as a USA carrier group converges on the Korean peninsula, ratcheting up tensions to their highest point in years.
Pence said he was disappointed that China had taken retaliatory actions against South Korea in response to the move.
If Kim is test firing missiles or conducting a nuclear test on North Korean soil, he's not moving across the DMZ and directly threatening other countries, Haggard pointed out. Trump tweeted yesterday morning, referencing his campaign threats to shame China's alleged trade misdeeds.
"Why would I call China a currency manipulator when they are working with us on the North Korean problem?"
"We have a wide array of tools at disposal for the president should he choose to use them", the official said.
There is growing speculation in the mainstream media and BlogosFear that the Trump regime following blasting of an mostly empty Syrian air-field with 59 Tomahawk cruise missiles and then dropping a MOAB on caves in Afghanistan is next set to launch a pre-emptive first strike against the North Korean rouge state's nuclear and missile infrastructure before it manages to achieve its objective of being able to put nukes onto missiles.
"We had good intelligence before the launch and good intelligence after the launch", the adviser told reporters on condition of anonymity.
The government has been also working on evacuation plans for about 60,000 Japanese from South Korea in case of a crisis.
"However, if it is true, this reflects that North Korea's nuclear development has advanced to the level it is a threat to China as well, and would show Beijing a means to align to the United States' position to strengthen sanctions on North Korea".
Despite China's historic intransigence on the issue, each act of continued belligerence on the part of Kim Jong-un has the potential to be the straw that breaks the camel's back with Xi.
"The North Koreans don't want to lose their nuclear facilities", Friedman said.
It failed, exploding about five seconds after it left the ground. In respect of which have a North Korean rogue state that openly threatens the United States is in China's strategic interests.
Sen. John McCain, R-Ariz., chairman of the Senate Armed Services Committee, agreed in an interview on NBC's Meet the Press that "China is the key".
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