North Korea accused the CIA and South Korea's intelligence service of attempting to assassinate its leader, Kim Jong-Un, with a bio-chemical weapon.
The cooperation between spies and the North Korean man, identified only by his surname, Kim, allegedly began in 2014 when agents approached him while he was working in Russian Federation.
Then, in April, reports suggested that China's patience with North Korea was wearing thin as Pyongyang continued to conduct nuclear missile tests, and that Beijing was considering a suspension of its crude oil exports to its neighbor should North Korea conduct a sixth nuclear test. To discuss, Worldview talks with Peter Hayes, director of the Nautilus Institute for Security and Sustainability in Berkeley, California. North Korea denied involvement.
"This heinous crime, which was recently uncovered and smashed in the Democratic People's Republic of Korea is a kind of terrorism against not only the DPRK but the justice and conscience of humankind and an act of mangling the future of mankind", North Korea's ministry of state security said in a statement.
North Korea's Ministry of State Security claimed agents paid an overseas North Korean laborer in the eastern Russian Federation to detonate a bomb with "radioactive" and "nano poisonous" substances when he attended a military parade in Pyongyang.
In Washington, the CIA declined to comment, and officials at South Korea's National Intelligence Service did not answer repeated phone calls.
"They told him that assassination by use of biochemical substances including radioactive substance and nano poisonous substance is the best method that does not require access to the target, their lethal results will appear after six or twelve months".More news: Engineer charged in deadly Amtrak crash
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"They hatched a plot of letting human scum Kim commit bomb terrorism targeting the supreme leadership during events at the Kumsusan Palace of the Sun and at military parade and public procession after his return home", KCNA said.
The ministry said the "intelligence and plot-breeding organisations of the USA imperialists and the puppet clique", referring to the South, would be swept away.
It comes after Mr Kim's estranged half-brother Kim Jong-nam was killed at a Malaysian airport after he was sprayed with a deadly nerve agent.
The US has sent a warship to the region and installed a controversial anti-missile defence system in South Korea.
"Yet Chinese and American analysts alike point out the likely limits of China's willingness to pressure North Korea to the extent the Trump administration desires", he said.
But he also said this week he would be willing to meet Kim Jong-un, in the right circumstances.