The row between the two countries comes before next week's Security Council ministerial meeting on North Korea chaired by US Secretary of State Rex Tillerson.
James Hoare, an associate fellow at Chatham House, and a research associate for the department of Korean Studies at SOAS, tells Newsweek: "Even in North Korea people have time off".
The Trump administration is making it known that the "era of strategic patience" is over.
Female North Korean soldiers march during the public parade.
The paper, obtained by The Associated Press, says the North's latest actions "make clear that further global pressure is required for the DPRK to change its behavior if there is to be any hope for meaningful denuclearization talks to resume". Analysts still believe the site is ready for another nuclear test at any time.
North Korea threatens "super-mighty preemptive strike" on U.S.
If the North tests another nuclear device, it would be a major show of defiance by Kim Jong Un, coming after President Donald Trump's repeated warnings against his country.
Acting president Hwang Kyo-ahn on Thursday asked the military to reinforce its defenses and warned that North Korea is poised to carry out a provocation around April 25.
Without O'Reilly, Fox News faces its toughest test
Seeing O'Reilly lose his job because of actions against women felt very cathartic, she said. A confidentiality agreement limits what the two sides can say.
"We will defeat any attack and meet any use of conventional or nuclear weapons with an overwhelming and effective American response", Pence said. But he said the "the DPRK remains unfazed".
In response to the latest military tests, the United Nations security council has threatened to impose strong new sanctions against Pyongyang for its "highly destabilising behaviour".
A soldier films North Korean soldiers, officers and high ranking officials attending a military parade at the weekend.
Visiting the Korean Peninsula gave more clarity to the situation, said Maloney.
With tension mounting between Pyongyang and Washington, analysts had thought they would see activity suggesting preparations for an underground explosion at the Punggye-ri nuclear test site and were not expecting what the photos, taken on Sunday by a commercial satellite, revealed.
One called for "dual-track" talks on denuclearisation of the Korean Peninsula - the top priority of the United States - and replacing the armistice that ended the 1950-53 Korean War with a formal peace treaty, a key demand of Pyongyang.
"I suspect that we have seen a bit of North Korean wind-up-for example, appearing to prepare for a test but not necessarily intending to carry it out while the USA is jittery", Hoare added.