Vice President Mike Pence, in his tour of the DMZ warned North Korea not to test Trump's military resolve.
North Korean military planners know that defense missile system is not able to cover the whole territory of South Korea.
"North Korea will do well not to test his resolve or (the) strength of the armed forces of the United States in this region", Pence said.
Mr Pence first made the remarks at the demilitarised zone (DMZ), the area dividing the two Koreas, during a visit to South Korea to reaffirm ties.
"Look, we want to be clear: our hope and frankly our prayer is that by marshaling the resources of nations across the Asian Pacific - not just South Korea, Japan, other allies - and China bringing renewed pressure to bear", he said.
Vice President Mike Pence told CNN that Pyongyang should understand that the Trump administration's approach toward the regime will be different than that of past United States presidents.
Pence's visit, full of Cold War symbolism, came amid increasing tensions and heated rhetoric on the Korean Peninsula.
The North regularly launches short-range missiles, but is also developing mid-range and long-range missiles meant to target US troops in Asia and, eventually, the USA mainland. Later, the Bush administration tried global pressure with the so-called "six party talks", but those failed too, and North Korea launched its first nuclear test in 2006.
Although U.S. allies Japan and South Korea are heartened by Trump's North Korea focus, his softer tack toward Beijing is causing concern.
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Despite North Korea's provocations, US officials have said that the USA doesn't intend to use military force against North Korea in response to either a nuclear test or a missile launch.
The BBC reported Han also said North Korea believed its nuclear weapons protect it from the threat of military action by the United States. The test appeared to fail, with a White House foreign policy adviser saying it was a medium range missile that exploded four to five seconds after it was launched from an eastern port city.
The Trump administration is hoping that China will help rein in North Korea in exchange for other considerations. -South Korean military exercises being staged now are the largest-ever "aggressive war drill" aimed at his country, formally the Democratic People's Republic of Korea.
Pamela Falk, former staff director of a House of Representatives Subcommittee, is CBS News TV & Radio Foreign Affairs Analyst & U.N. Resident Correspondent and holds a J.D. from Columbia School of Law. Pence says, "North Korea would do well not to test his resolve". The report resulted in rising fears not only in South Korea but among North Korea experts in the US.
It has carried out five nuclear tests -- two of them past year -- and multiple missile launches, one of which saw several rockets come down in waters provocatively close to Japan last month.
Despite Trump's argument that China is taking North Korea seriously, China remains adamantly opposed to USA deployment of an advanced missile defense system in South Korea. And before he leaves for Japan, Pence will speak with South Korean business leaders to explain the administration's economic policies due to fears Trump is taking the US down the path of protectionism.
However, earlier this month, during an interview with Financial Times, Trump said the U.S.is prepared to act alone - without China, if necessary - in order to deal with Kim's regime.
The fact that South Korea hasn't even had a president since Trump took office - the previous one, Park Geun-hye, was busy getting impeached, and the next one won't be elected until May 9 - hasn't helped.