In 2012, North Korea’s military warned that its troops had aimed artillery at the specific coordinates of South Korean media groups over their critical reports on children’s festivals that had been taking place in Pyongyang, threatening a “merciless sacred war” over perceived insults.

North Korea vowed to take “counterterrorism measures” in response to what it claims are CIA and South Korea intelligence conspiracies to assassinate Kim Jong Un.

US President Donald Trump has promised to “solve” North Korea and stop it developing nuclear weapons.

The country’s Ministry of State Security claimed that Central Intelligence Agency agents worked with South Korean spies to recruit an “ideologically corrupted and bribed” North Korean citizen to carry out the plot.

The ministry said the citizen had been recruited while working in Russian Federation in June 2014 and received a series of payments in return for his cooperation, according to reports in state media.

“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.

Giving details of the failed assassination plot, the statement said that the killer was told that the use of biochemical substances “including radioactive substance and nano poisonous substance is the best method that does not require access to the target”.

North Korea on Friday accused the US and South Korean spy agencies of an unsuccessful assassination attempt on leader Kim Jong Un involving biochemical weapons.

Analysts concur that a possible suspension of China’s oil exports would have a major impact on North Korea, but they are more inclined to believe that China would not use its biggest punitive measure as leverage over North Korea-a total oil embargo-if Pyongyang is carrying out low-intensity provocations.

The ministry demanded that the United States and South Korea apologize and execute the intelligence agents involved in the “heinous” plot.

When 13 North Korea restaurant workers in China defected to the South a year ago, Pyongyang claimed that South Korean spies kidnapped the workers.

Pyongyang warned this week that USA hostility had brought the region to the brink of nuclear war. It said the plot was a “last-ditch effort” by United States “imperialists” and South Korea that had gone “beyond the limits”. North Korea claimed in 2015 that it had invented a miracle drug capable of preventing and curing Ebola, as well as AIDS, Sars, and Mers, so the regime apparently has little to worry about.

Earlier this year, Kim Jong-un’s half brother, Kim Jong-nam, was killed with the banned nerve agent VX at Kuala Lumpur worldwide airport.

On Thursday, a think tank report from inside the US Congress said that the US’ controversial THAAD missile defense system that has begun to be deployed in South Korea may not be capable of actually intercepting North Korean nukes directed around the Korean Peninsula and toward Japan.