Another U.S. official also dismissed the report, calling it "speculative at best".
The festivities take place amid concerns that North Korea is possibly preparing its sixth nuclear test in a decade or a rocket launch of significance, such as its first flight test of an ICBM. "It seems that the USA and China agreed on U.S. coercion and China's role in restraining North Korea's nuclear development at the summit, and the North Korean authorities appear to be taking into consideration this external pressure", Cho Han Bum, a senior researcher at the Korea Institute for National Unification told Daily NK.
Wang last month urged North Korea to suspend its nuclear weapon and missile tests in exchange for South Korea and the USA putting their war games on hold, reviving a proposal first raised by Pyongyang.
A new intermediate-range ballistic missile - known as the Pukkuksong-2 - also appeared in the parade to commemorate the 105th birth anniversary of Kim Il-sung - the North's late founding leader and granddad of Kim Jong-un.
No planned response is expected from the Trump administration because the official, who spoke on condition of anonymity to discuss the administration's initial understanding of the launch, said there was no need for the U.S.to reinforce the failure. That threat, however, has been made numerous times in the past. "The president has no further comment". China is North Korea's lone major ally, but has spoken out against its missile and nuclear tests and has supported United Nations sanctions. North Korea's official name is the Democratic People's Republic of Korea.
"The president and his military team are aware of North Korea's most recent unsuccessful missile launch, a statement from US Secretary of Defence Jim Mattis read". Cold launches would also allow the missiles to be fired from silos. The deployment is created to show that the USA could shoot down any missiles that North Korea may fire. The official added that if the US shows any sign of "reckless" military aggression, Pyongyang is ready to launch a pre-emptive strike of its own.
This year, however, the holiday also showcased what appeared to be long-range and submarine-based missiles: weapons the country has always been warned against possessing.
Amid the elevated tensions, the United States a few days ago dispatched what Trump called an "armada" of ships in a show of force, including an aircraft carrier, into waters off the Korean Peninsula.More news: US tells North Korea: We don't want a fight, don't start one
Among the hardware on display appeared to be new intercontinental and submarine-launched ballistic missiles.
A North Korean foreign minister vowed the isolationist country "will go to war" if the US provokes it, as the world watched to see if dictator Kim Jong Un will launch another provocative nuclear test today to commemorate his grandfather's birthday. "The launch of the ballistic missile occurred near Sinpo", said Commander Dave Benham, a spokesman for the US Pacific Command.
Another missile test from Sinpo failed earlier this month, when the rocket spun out of control and plunged into the ocean.
Trump added that he had been negotiating directly with Chinese President Xi Jinping on the Korean matter.
China, North Korea's sole major ally and neighbour, which nevertheless opposes its weapons programme, has called for talks to defuse the crisis.
"Although the Trump Administration has not yet clearly established its policy on North Korea, it is possible that hardline measures, including a preemptive strike, might be considered if North Korea conducts a high-intensity provocation".
Despite Sunday's failure, the North's previous claim to have used "standardized" warheads has led to worries that it was making headway in its push to develop small and sophisticated warheads to be topped on long-range missiles.
Some point out that North Korea is trying to maintain good relations with its allies in Southeast Asia while mending relations with the U.S. and China. Pyongyang recently tested a ballistic missile and claims it is close to perfecting an intercontinental ballistic missile and nuclear warhead that could attack the US mainland.