NK won’t agree to anything without approval from their puppet masters, Russia and China.
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Russia and North Korea declare 2015 a ‘year of friendship’
“The biggest cause for concern is the growing military alliance between Russia and North Korea, with the two regimes recently announcing plans to conduct a series of joint army, navy and air force exercises this year.”
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Russia steps up North Korea support to constrain US
May 17, 2017
“Despite efforts by the United Nations to impose isolating sanctions on North Korea in response to the country’s continued development of nuclear weapons and intercontinental ballistic missiles, trade between Russia and North Korea soared more than 85 percent in the first four months of the year.”
http://www.dw.com/en/russia-steps-up-north-korea-support-to-constrain-us/a-38867861
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Sept 5, 2017
North Korea nuclear crisis: Putin calls sanctions useless
Russian President Vladimir Putin has said pursuing further sanctions against North Korea is “useless”, saying “they’d rather eat grass than give up their nuclear programme”.
The US said on Monday it would table a new UN resolution on tougher sanctions in the wake of the latest test of a nuclear bomb by the North on Sunday.
Mr Putin also said that the ramping up of “military hysteria” could lead to global catastrophe.
He said diplomacy was the only answer.
China, the North’s main ally, has also called for a return to negotiations. ...”
http://www.bbc.com/news/world-asia-41158281
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From the Sino-Russian Joint Statement of April 23, 1997:
“The two sides [China and Russia] shall, in the spirit of partnership, strive to promote the multipolarization of the world and the establishment of a new international order.”
http://www.atimes.com/atimes/Central_Asia/HI29Ag01.html
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“Joint war games are a logical outcome of the Sino-Russian Friendship and Cooperation Treaty signed in 2001, and reflect the shared worldview and growing economic ties between the two Eastern Hemisphere giants.”
http://www.heritage.org/research/commentary/2005/09/war-games-russia-china-grow-alliance
This deal was made well before Singapore happened and was primarily with China and Russia. Donald Trump really isn’t stupid.