Intelligence agencies and analysts had warned that North Korean leader Kim Jong Un might commemorate the annual holiday Saturday marking the 105th birthday of his grandfather Kim Il Sung, the founder of North Korea, to conduct a nuclear weapons test or yet another missile test.
Professor Wang noted that while the United States has been displaying its military might to send a message to North Korean leader Kim Jong Un, including sending a naval strike force to the region, it has said that it is not seeking a regime change in the country.
In a test launch in August past year, the missile flew 500 kilometers (310 miles) after being launched from a submarine and crashed into waters near Japan, prompting Kim Jong Un to declare that North Korea had gained "perfect nuclear-attack capability".
Moreover, the North has taken the recent deployment of a US naval strike group to the region as grounds for its continued testing of nuclear and missile weapons technologies.
U.S. Vice President Mike Pence is embarking on a 10-day, four-nation tour of the Asia-Pacific this weekend, arriving in South Korea after a failed missile launch by the North.
Several KN-08 missiles were rolled out on trucks at the parade.
But Choe Ryong Hae, reportedly the second-most powerful official in the country, said in a speech that Pyongyang is prepared for any threat posed by the United States.
Trump's decision to order a cruise missile strike on a Syrian airfield this month, in response to what he said was Syria's use of chemical weapons, raised questions about his plans for reclusive North Korea.
"All the brigandish provocative moves of the USA in the political, economic and military fields pursuant to its hostile policy toward the DPRK will thoroughly be foiled through the toughest counteraction of the army and people of the DPRK", the North's KCNA state news agency said.
South Korea's military said they would continue to analyse the test for more details.
Donald Trump recently tweeted that "the problem of North Korea" would be "taken care of".
Kim was greeted Saturday with thunderous applause as he stepped into view on a large podium, clapping to acknowledge the thousands of soldiers and civilians taking part in the parade at Kim Il Sung Square.
Pyongyang has also expressed anger over the ongoing annual spring military exercises the USA holds with South Korea, which it considers a rehearsal for invasion. Analysts say the missiles could one day be capable of hitting targets as far as the continental United States, although North Korea has yet to flight test them.
"And making it without prompting a furious response from Washington surely qualifies as a win to some degree from Kim's perspective", it said, referring to Kim Jong Un.
The display included submarine-launched ballistic missiles, believed to be the same type of missile North Korea fired from land in February.
According to the statements, "Japan does not tolerate repeated provocations like this by North Korea", and protested to the North over the action.
While the parade carried on, a top official did not hesitate to bring up the USA and the possibility of nuclear war.
"All options are on the table to achieve the objectives and ensure the stability of the people of this country", he told reporters as tinny propaganda music floated across from the North Korean side.
North Korea conducted two nuclear tests past year alone, advancing its goal to make nuclear weapons small enough to fit on long-range missiles. The country conducted two nuclear tests past year.
So-called cold launches would also allow the missiles to be fired from silos.