Russian Foreign Minister Sergei Lavrov in Pyongyang on Thursday invited North Korean leader Kim Jong Un to visit Russia, Moscow said, during the first meeting between the head of the reclusive state and a Russian official.
A round of general-level military talks will be held on June 14 and a Red Cross meeting to plan a reunion for war-separated families is scheduled for June 22.
Kim is expected to president a letter from Kim Jong Un (kim jawng oon), the North Korean dictator, to Trump.
Kim Yong-chol delivered a letter from the North Korean leader to Trump during their meeting at the Oval Office.
After arriving at the White House on Friday afternoon, the North Korean official was seen being ushered into the West Wing by the president's chief of staff, John Kelly.
"I look forward to seeing what's in the letter", the President said as he left Joint Base Andrews for a trip to Houston. "Oh, would you like to see what was in that letter". How much? How much?
"And frankly, I said, 'Take your time".
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The White House said talks of the "total denuclearization of the peninsula" do not extend to USA weapons systems - a defense umbrella covering South Korea that includes nuclear-armed submarines and strategic bombers capable of carrying nuclear bombs not based on the peninsula.
Singapore, a small but wealthy Southeast Asian city-state, is determined to successfully host the summit and is willing to foot at least some of the bill.
Russian Federation has appeared to be on the fringes of a flurry of diplomacy as Pyongyang and Washington edge towards talks aimed at ending years of tension over North Korea's nuclear programme.
His travel restrictions were lifted this week so he could fly to NY and Washington, DC to meet USA officials, the Department of State said. Hours later, Trump said the summit was potentially back on.
President Trump's remarks follow months of pressure from China and South Korea on Washington to invest in the economic reconstruction of North Korea, ravaged by almost a century of oppressive communist rule. Trump wants to use the meeting to pressure Pyongyang into giving up its nuclear weapons. In this way, the video is an unusual admission of the poor state of North Korea's economy and the helplessness of its leadership.
Trump is scheduled to meet Kim Jong Un in Singapore on June 12, which will mark the first time a sitting United States president will meet face-to-face with a North Korean leader.
The summit, planned since April, was called off just a week ago by Trump amid a renewed round of heated rhetoric from Pyongyang and concerns over whether North Korea was honest about "denuclearization". "We never were. I told him today, "Take your time", he said, adding nevertheless that he expects "a really positive result in the end".