Why Does North Korea Have No Choice but to Suspend Nuclear Tests?

Why Does North Korea Have No Choice but to Suspend Nuclear Tests?
South Korea Holds Ballistic Missile Drill In Response To North Korea Nuke Test. In this photo provided by South Korea Defense Ministry, South Korea's Hyunmoo II ballistic missile is fired during an exercise at an undisclosed location in South Korea, Monday, Sept. 4, 2017. South Korea Defense Ministry via NUR
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North Korean leader Kim Jong Un announced on April 20 that the country will suspend nuclear tests and missile launches. Why did the dictator suddenly decide to submit to international demands to denuclearize after increased nuclear testing throughout the past year?

A longtime Chinese blogger who frequently comments on domestic economic news, with the pseudonym Manzu Yongshi, penned an article on April 23, explaining that the regime’s about-face may have to do with its rapidly declining trade with China as a result of international pressure, threatening its survival.