Further details mentioned in the report about the "terrorist" indicate that the individual's last name is also Kim and that the interaction with the Central Intelligence Agency and NIS occurred in June 2014.
Pyongyang claims the CIA and Seoul's Intelligence Services had "hatched a vicious plot" to kill the secretive state's young leader as he attended ceremonial events.
It has repeatedly threatened Kim with a military response to new tests of missiles and nuclear warheads, and sent warships and a nuclear submarine to Korean waters.
North Korea's Ministry of State Security said Friday that the U.S. Central Intelligence Agency and South Korea's National Intelligence Service had "ideologically corrupted" and bribed a North Korean timber worker employed in Russian Federation to return to the country and try to kill its leader.
It did not mention Kim Jong-un by name, but he is widely referred to as the supreme leader.
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In the statement Friday, the ministry said in response to the alleged plot on Kim Jong Un, a "Korean-style anti-terrorist attack will be commenced from this moment to sweep away the intelligence and plot-breeding organizations of the USA imperialists and the puppet clique", referring to South Korea.
"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".
"Only the Central Intelligence Agency can produce such substance", it said, adding that South Korea had borne the funding.
"By relentlessly bringing in a number of strategic nuclear assets to the Korean peninsula, the U.S.is gravely threatening the peace and safety and driving the situation to the brink of a nuclear war", North Korean officials said in a statement in April, according to KCNA. The statement said Kim had received a total payment of about US$740,000 and was given satellite transceivers and other materials and equipment.
The dictatorship's security ministry said it would take vengeance against the countries.
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The ministry statement gave no details of how the alleged plan had been uncovered or about the fate of "Kim", whom it described as "human scum". It claimed the plot was conceived back in 2014 by South Korean and US intelligence agencies.
The half-brother of Kim Jong-un was poisoned with the VX nerve agent at Kuala Lumpur airport and died en route to a hospital.
China is increasingly finding itself in a position to consider imposing an oil embargo, a last-resort measure to deter North Korea from its nuclear weapons ambitions, after the U.S. House of Representatives voted to toughen sanctions against the North Korean regime, according to experts quoted by South Korea's Yonhap News Agency.
North Korea warned that United States hostility brought the region to the brink of nuclear war.
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On Monday, President Donald Trump admitted that he'd be "honored" to meet with the North Korean dictator.