Still, Wednesday's release of the Americans raises the possibility that their cases will be addressed in future talks with the North, including a meeting between North Korean leader Kim Jong Un and President Trump that could happen in the coming weeks.
"If North Korea takes bold action to quickly denuclearize, the United States is prepared to work with North Korea to achieve prosperity on par with our South Korean friends", he said.
US-based North Korean analysis website 38 North asserted that the two portals remain "viable" for nuclear tests, corroborating Kim's assertion.
When North Korea detonated its most recent nuclear weapon deep inside its mountain test site, the peak's flanks heaved up and outwards by a few metres, according to a detailed reconstruction of the event and its aftermath.
North Korea announced Saturday it will publicly dismantle its northern nuclear test site in a ceremony scheduled for between May 23 and 25, adding it is taking "technical measures" to that end. The railroad proposal is likely part of a broader plan to connect South Korea and China by rail lines, which would go through the north.
"There is anticipation and some guarded optimism about possible changes in relations between the USA and North Korea", Faso reported on his return from South Korea last Friday.
The isolated Asian nation, which had already pledged to begin dismantling the site this month, will invite journalists from China, Russia, the US, the United Kingdom and South Korea to cover the event, KCNA said in the statement.
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It follows a period of improved relations between the United States of America and North Korea.
North Korea has invited the outside world to witness the dismantling of its nuclear facilities before.
The ministry said the North will continue to "promote close contacts and dialogue with the neighbouring countries and the worldwide society so as to safeguard peace and stability on the Korean Peninsula and over the globe".
Ground movement on Mt. Mantap caused by North Korea's September 3 underground nuclear test. Arrows indicate horizontal displacement; color indicates vertical motion.
President Trump tweeted Thursday that his "highly-anticipated" meeting with Kim will take place in Singapore on June 12.
Choi believes his father was executed in North Korea in 1970.
"We're not talking about sanctions relief at this point", she said.
Pompeo for the second time this year visited North Korea.