The newly appointed US Special Envoy for North Korea Stephen Biegun met South Korean Foreign Minister Kang Kyung-hwa and South Korean nuclear envoy Lee Do-hoon in Seoul on Tuesday. Biegun, who was named late last month as special representative for North Korea, listened as Lee described US-Korean cooperation as 'key.' «Now we are faced with challenges as well as opportunities in terms of... Еще making progress on denuclearisation and establishing peace regiment in Korean peninsula,» Lee said. It is Biegun's first trip abroad in the role and comes in the wake of US president Donald Trump's 12 June summit with North Korean leader Kim Jong Un. Although North Korea has destroyed at least parts of its nuclear test site, and says it has dismantled a missile engine test site, it has yet to declare what is in its atomic arsenal or take concrete steps to end its weapons programme. Last month, the UN atomic watchdog expressed «grave concern» over the continuation and development of Pyongyang's nuclear programme.