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China's Communist Party adopted the undercover mission in September to bolster the North Korean government with increased aid and military support, the document shows.
This was contingent on Pyongyang halting further nuclear tests, the internal party document labelled “top secret” said.
Dated September 15 – just 12 days after North Korea's latest underground nuclear blast – it outlines a plan for dealing with the nuclear issue.
It states China will allow North Korea to keep its current arsenal of nuclear weapons – completely against its public policy as agreed with the US.
China also seeks in the document to keep dictator Kim Jong-un in power and bolster his regime with even more missiles.
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“China has no real commitment to pressuring North Korea to give up nuclear weapons”John Tkacik
A copy of the four-page document was obtained by the Washington Free Beacon from a former Chinese intelligence officer.
China's leaders, according to the document, concluded that international pressure will not force Pyongyang to give up its nuclear weapons.
It is believed North Korea has at least 20 warheads.
So China officials believe the best way of getting North Korea to the negotiating table is to reassure it of the country’s continued backing.
As part of the deal proposed in the document, China will increase aid to North Korea by 15% in 2018 and this will continue to increase year-on-year until 2023.
On weapons, the document said that China is offering North Korea "defensive military construction" and "high-level military science and technology”.
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The military backing would include "more advanced mid and short range ballistic missiles, cluster munitions, etc," the document said.
"Your department should at the same time seriously warn the Korean authority not to overdo things on the nuclear issue," the document said.
"Currently, there is no issue for our country to forcefully ask Korea to immediately and completely give up its nuclear weapons."
“Instead, we ask Korea to maintain restraint and after some years when the conditions are ripe, to apply gradual reforms and eventually meet the requirement of denuclearisation on the Korean Peninsula," it continued.
This comes as it was revealed Chinese robots will treble bomb production for the communist state.
China’s foreign ministry today denounced the apparent secret documents as fake.
But many experts said they appear genuine.
Orville Schell, director of the Center on US-China Relations at the Asia Society in New York, said he they had "an air of veracity".
"The language in Chinese is spot on party-speak, and the logic of the argument would appear to be congruent with the current line and what is happening,” he said.
Former US State Department intelligence official John Tkacik, a China affairs specialist, said that if they are confirmed as authentic, they would be “a bombshell".
Mr Tkacik said the document may be "evidence that China has no real commitment to pressuring North Korea to give up nuclear weapons".
Former US Ambassador to the United Nations John Bolton said if the document is authentic "it reveals China's policy to be completely cynical and utterly detached from its publicly stated position”.
"The White House would have to react accordingly," he added.