A high level North Korean defector has warned Donald Trump that Kim Jong-un is duping him and will never denuclearize. It comes as the US ambassador to the United Nations warned Pyongyang on Wednesday of the consequences it would face if it carries out the threat of a missile test in the New Year. The defector wrote a letter to the President urging that the US should impose heavy sanctions to preempt any nuclear flexing by Kim and consider fomenting a coup. ‘As long as Kim Jong-un remains in power, denuclearization of North Korea is permanently impossible because [Mr. Kim] regards nuclear weapons as the last means to defend his survival,’ the defector wrote in the letter obtained by The Washington Times. U.S. President Donald Trump meets with North Korean leader Kim Jong-un at the border village of Panmunjom in the Demilitarized Zone on June 30, 2019. The defector warned that Kim’s outwardly cozy appearance was a disguise for aggression behind the scenes Yesterday, the US ambassador Kelly Craft (pictured), voiced concerns about the North’s ominous ‘Christmas Gift’ if the US did not make concessions by the end of the year ‘You have stopped Kim Jong-un from launching missiles and…