Kim Jong-un Vows Support for the One China Policy During Visit with President Xi
If Kim Jong-un wants to improve relations with Xi, strongly stating support for the One China Policy is a way to do it:

North Korean leader Kim Jong-un said Monday deepening ties with China is his country’s top policy priority, as he held summit talks with Chinese President Xi Jinping in Pyongyang, according to a report.
The Kim-Xi talks came hours after the Chinese leader arrived in Pyongyang for his first state visit in nearly seven years.
Developing friendship between the North and China is “the people’s choice and the calling of the times,” China’s Xinhua News Agency quoted Kim as saying during the talks with Xi.
Kim said Pyongyang viewed the development of mutual ties as the country’s “most important strategic priority.”
With the international community “going through unprecedented, grand change,” he reaffirmed Pyongyang’s support for Beijing’s “One China” principle and pledged to keep helping safeguard China’s core interests, according to the report.
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Xi is a reasonable man.
Trump needs to make a deal.
America supports the One China Policy if China supports the One America Policy.
This is the best strategy to get control over the 51st state of Canada and the renegade provence of Greenland.