On show to insight international fear, the missiles demonstrated during Kim Jong-un's weekend parade are being called fakes after footage captured them appearing to be wobbling and out of alignment.
Ballistic rockets were on display at Saturday's military parade at Pyongyang to mark the 105th birthday of the state's late founder Kim Il Sung.
Almost 60 long-range and submarine-based missiles were on show as tensions mounted overJong-un's nuclear ambitions.
The display initially caused international fears North Korea's nuke program was more advanced than previously thought.
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North Korean military official Choe Ryong-Hae said the state was ready to respond to "an all-out war” if the US launched an attack, after reports US President Donald Trump was considering "utterly destroying" North Korea's nuclear sites, a senior While House adviser has told media.
A source told British diplomats America could launch pre-emptive strikes and has the firepower to smash the rogue nation's whole nuclear program, News Limited has reported.
“If the United States wages reckless provocation against us, our revolutionary power will instantly counter with [an] annihilating strike… with our style of nuclear strike warfare,” Ryong-Hae said.
But doubts have been raised over the legitimacy of the weapons after experts began to notice anomalies in the missiles.
A senior analyst at the Korea Defence Network told AFP: “I suspect they all might be mock-ups aimed to impress the outside world.”
The nose cone of one of the devastating rockets “wobbled quite noticeably” according to Chad O’Carroll, managing director of specialist service NK News, who was also skeptical of the weapons.
The "wonky" rockets were also spotted behind a BBC journalist who was reporting at the parade, as missiles with bent nose cones passed in the background.