North Korean leader Kim Jong Un's promise to dismantle his country's only known nuclear test site later this month has shone the spotlight on the secretive facility near the Chinese border. The Punggye-ri test site, located beneath a mountain in the country's northeast, has hosted all six nuclear tests Pyongyang has conducted -- most recently last September. The announcement comes as the diplomatic push for Pyongyang to give up its nuclear weapons gathers pace ahead of Kim's eagerly-awaited -- and unprecedented -- summit with US President Donald Trump on June 12.



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