President Donald Trump and North Korean dictator Kim Jong-un will meet for the first time June 12 in Singapore for their summit to discuss the denuclearization of the peninsula, the chief executive announced Thursday on Twitter.

“The highly anticipated meeting between Kim Jong Un and myself will take place in Singapore on June 12th. We will both try to make it a very special moment for World Peace!” Trump tweeted.

The summit nobody expected will mark the first time a U.S. president has met with North Korea’s leader since the communist nation was formed in 1948.

Officials from both countries views Singapore as a suitable location because the country maintains diplomatic ties with both nations.

Secretary of State Mike Pompeo flew to North Korea earlier in the week to complete the summit’s details and negotiate the release of three Americans held captive in North Korea. Trump greeted the three detainees — Kim Dong Chul, Tony Kim, and Kim Hak-song — when they returned early Thursday morning.

Vice President Mike Pence said in a statement Wednesday that the three Americans were released “thanks to President Trump’s tough-minded diplomacy.”

“While our administration is encouraged that North Korea freed these innocent hostages, we will not let off the pressure until we achieve full denuclearization,” Pence said. “This is a proud and memorable moment for America.”

Kim and South Korean President Moon Jae-in also set the stage for Trump’s meeting with Kim when they held an historic meeting in April to discuss denuclearization and peace talks. The North Korean leader crossed the Demilitarized Zone (DMZ) at the border separating the two nations to meet Moon.

Kang Kyung-wha, South Korea’s foreign minister, told CNN in April that her country credited Trump with bringing about the conditions that led to the meeting.

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“Clearly, credit goes to President Trump,” Kang told CNN’s Christiane Amanpour. “He’s been determined to come to grips with this from day one.”

Many U.S. politicians and global leaders also credit Trump for his work in helping to bring about the peace talks between North and South Korea and coordinating economic sanctions and outside pressure to bring Kim to the negotiating table.

Related: Trump and Pompeo Secure the Release of Three North Korean Detainees

Trump’s decision Tuesday to withdraw the U.S. from the Obama-era Iran nuclear deal served as a precursor for his plan to approach the North Korean summit, national security adviser John Bolton said Tuesday on “The Ingraham Angle.”

“President Trump said this sends North Korea a signal that we’re not in these discussions with Kim Jong-un just to have a deal. We’re in them to denuclearize North Korea,” Bolton said. “It’s an indication of how serious President Trump is.”

PoliZette writer Kathryn Blackhurst can be reached at [email protected]. Follow her on Twitter.