China, North Korea’s largest trading partner and the regime’s primary backer, is not living up to their sanctions, “The Coming Collapse of China” author Gordon Chang told FOX Business on Tuesday.

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“I think President Trump was a little too generous to Xi Jinping because over the last three months we have seen blatant sanctions violations by China,” he told Maria Bartiromo on “Mornings with Maria.” “Their behavior has remarkably deteriorated.”

Trump and North Korean leader Kim Jong Un signed a “comprehensive document” of progress on Tuesday aimed at denuclearization following their historic summit in Singapore.

Chang said it’s highly likely that Kim will “drag his feet on this” which would ultimately result in the United States imposing costs.

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