Tony Kim, Kim Hak-song, and Kim Dong-chul-three US citizens with Korean heritage-were released by the North Korean regime in what the country's state media said was a decision to grant "amnesty" by Kim Jong-un.
Trump was initially pressing for the meeting to be held in the Demilitarized Zone (DMZ) between North and South Korea, tweeting: "Numerous countries are being considered for the MEETING, but would Peace House/Freedom House, on the Border of North & South Korea, be a more Representative, Important and Lasting site than a third party country?"
It will be the first meeting between a sitting US President and a North Korean leader.
With US help, those countries recovered from the devastation of conflict.
"If North Korea takes bold action to quickly denuclearize, the United States is prepared to work with North Korea to achieve prosperity on the par with our South Korean friends", he said.
He has had two recent meetings with Mr Kim to prepare for the summit and to negotiate the release of three Korean-Americans held in the North's jails.
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Amid a barrage of cameras and hundreds of journalists the President was accompanied by his wife Melania when he met them at the Andrews Air Force Base in Maryland, just outside Washington. "What a blessing. They would have sat there for years and years", Lindell said.
While the release of American citizens from North Korea back to the United States has been universally viewed as a positive, others are skeptical of Donald Trump.
Administration officials consider the release an encouraging signal ahead of next month's summit.
During his meeting with Kim Jong Un, Moon explained the Japanese government position of resolving the issues of North Korea's nuclear weapons and ballistic missiles as well as the abductions, and to make a final accounting of past problems, as part of the process of normalizing relations with North Korea.
"We have to be able to go into their military bases to see whether or not they're cheating ..."
"North Korean leader Kim Jong-un did a great service to himself and to his country by doing this. -North Korea summit, Japan will firmly tell its stance" to the United States, the prime minister added.
The focus of the talks is expected to be be North Korea's nuclear weapons development and testing program, which has deepened long-seated tensions between Washington and Pyongyang. But North Korea has said it is willing to talk now because it has already succeeded in becoming a nuclear-armed state, fueling skepticism the North would truly being willing to give those weapons up. "We hope the denuclearization of the Korean peninsula as well as permanent peace on the peninsula will successfully come about through this summit".