SEOUL—North Korea said it would shut down its nuclear test site in May and take steps to demonstrate the closure to the world, South Korea’s presidential office said Sunday, adding to momentum for a deal on the regime’s nuclear program after historic talks last week between the two sides.
During a summit meeting on Friday with South Korean President Moon Jae-in at the inter-Korean demilitarized zone, North Korean leader Kim Jong Un reaffirmed his willingness to give up his nuclear weapons in exchange for a security guarantee...