In the same press conference, spokesman Lu Kang praised recent USA statements on the North Korean issue. Foreign Ministry spokesman Lu Kang said tensions need to be eased on the Korean Peninsula to bring the escalating dispute to a peaceful resolution. "He holds his cards close to the vest and I think you're not going to see him telegraphing how he's going to respond to any military or any other situation going forth", Spicer said.
North Korean Vice-Foreign Minister Han Song Ryol told the BBC that missiles will still be tested on "a weekly, monthly and yearly basis".
"If the U.S.is reckless enough to use military means, from that very day, there will be all out war".
The unannounced trip allowed the vice president, whose father fought in the Korean War, to look at North Korean soldiers from afar and gaze directly across a border marked by razor wire.
Trump, in Washington, and Pence at the tense Demilitarized Zone between North and South Korea earlier, have signalled a forceful USA stance on North Korea's recent actions and threats.
But, as is usually the case, there's an air of unpredictability surrounding Trump's stance on North Korea.
Tensions on the Korean peninsula have been running high as the North continues to engage in provocative behavior in violation of global restrictions.
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The "strategic patience" doctrine, which was used by the previous Barack Obama administration, hinged on the U.S. focusing on isolating North Korea by putting pressure on them through sanctions and waiting for them to denuclearise.
"But the era of strategic patience is over", Pence declared.
Pence also said that the USA would work with its allies and China to exert more economic and diplomatic pressure on the North and increase its military presence in the region. With no US trade representative yet in office and other key positions still unfilled, such nitty-gritty discussions will have to come later. But at the same time, McMaster said on "This Week" on ABC that "it's time for us to undertake all actions we can, short of a military option, to try to resolve this peacefully".
On Tuesday, while visiting Tokyo, he called the North Korea regime "the most ominous threat" to the region. President Trump met with Chinese President Xi Jinping in a summit early April to negotiate cooperation between the two countries.
Earlier Tuesday, Vice President Mike Pence said during a visit to Japan that what the U.S. and other countries are concerned about are the "reckless and irresponsible actions of the regime in Pyongyang". Yet North Korea has continued to paint the U.S.as the aggressor.
A sales manager for a Sinotruck dealer, Zhongnanhai, said the company exports about 1,000 trucks to North Korea every year under contracts that specify the vehicles are designed and manufactured for civilian use. Rex Tillerson, U.S. Secretary of State, said last month that pre-emptive military action was on the table.
As the USS Carl Vinson heads towards the peninsula, along with two other carriers, the Pentagon is looking for ways short of war to pressure North Korea into de-nuclearization, particularly if Pyongyang goes forward with an anticipated sixth nuclear test.
On Sunday, Lt Gen HR McMaster, the United States top security adviser, said his country was working on a "range of options" with China, the first confirmation the two countries were co-operating to find a solution to the North Korean issue.