U.S. Wants Proof North Korea Is Dismantling Its Nuclear Program

As meeting with U.S. nears, North Korean leader Kim Jong Un pledges to shut down Pyongyang’s nuclear-test site

The two Koreas have technically been at war for more than six decades. That's about to change, say North Korean leader Kim Jong Un and South Korea's Moon Jae-in. But what would peace on the peninsula look like?
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Top U.S. officials expressed caution about North Korean leader Kim Jong Un’s pledge over the weekend to shut down Pyongyang’s nuclear-test site, saying the dismantling of the North’s weapons program must be “irreversible” and verifiable.

North Korea said it would shut down the site by May and take steps to demonstrate the closure to the world, South Korea officials said.

During...