Why did Kim Jong Un blow up his nuclear test site?

STANFORD, Calif. — When President Trump abruptly canceled the summit with North Korea last week, it overshadowed the closing of North Korea’s nuclear test site just a few hours before. Although it is not irreversible, blowing up the site’s tunnels, sealing the entrances and removing test site facilities and equipment was nevertheless a serious step toward denuclearization. What possessed North Korean leader Kim Jong Un to take this step now?

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