FILE - In this Feb. 9, 2018, file photo, athletes from North and South Korea wave Korean unification flags as they walk on stage during the opening ceremony of the 2018 Winter Olympics in Pyeongchang, South Korea. Hundreds of North Koreans go to the Pyeongchang Games in February, including leader Kim Jong Un's sister Kim Yo-Jong, who conveys her brother's desire for an inter-Korean summit with South Korean President Moon Jae-in. (AP Photo/Charlie Riedel, File)

SEOUL, South Korea (AP) - The upcoming meeting between President Donald Trump[1] and North Korean leader Kim Jong Un[2] in Singapore[3] on Tuesday will kick off a potentially lengthy diplomatic process to try to resolve the standoff over Pyongyang[4]’s pursuit of nuclear weapons. A look at how diplomacy took shape this year:

Jan. 1: After an unusually provocative 2017 during which North Korea[5] tested a purported thermonuclear warhead and three intercontinental ballistic missiles, Kim[6] tries to initiate diplomacy in his annual New Year’s address. He calls for improved relations and engagement with South Korea, though adds that he has a nuclear button on his desk. Trump[7] responds on Twitter that he has a bigger and more powerful nuclear button, adding “and my Button works!”

Jan. 9: North and South Korean officials meet at a border village and agree on North Korea[8] sending athletes and delegates to the Winter Olympics in the South. Hundreds of North Koreans go to the Pyeongchang Games in February, including Kim’s sister, who conveys her brother’s desire for an inter-Korean summit with South Korea’s president.

March 7: South Korea’s presidential national security director Chung Eui-yong visits Kim[9] in Pyongyang[10] and reports that Kim[11] is willing to discuss the fate of his nuclear arsenal with the United States.

March 9: South Korean envoys meet Trump[12] in Washington and deliver an invitation from Kim[13] to meet; Trump[14] accepts.

March 27: Kim[15] makes a surprise visit to Beijing for a meeting with Chinese President Xi Jinping in an apparent move to strengthen his leverage ahead of any talks with Trump[16].

April 18: Trump[17] confirms that Mike Pompeo, then the CIA chief, had met Kim[18] secretly in North Korea[19] and said “a good relationship was formed” heading into the anticipated summit.

April 21: North Korea[20] says it has suspended nuclear and ICBM tests and plans to close its nuclear test site as part of a shift in its national focus to developing its economy. Trump[21] tweets: “This is very good news for North Korea[22] and the World.”

April 27: Kim[23] holds a summit with South Korean President Moon Jae-in. The leaders announce aspirational goals of a nuclear-free Korean Peninsula and permanent peace....

May 7: Kim[24] meets Xi again in China and calls for stronger strategic cooperation between the traditional allies.May 9: Pompeo, now U.S. secretary of state, makes another visit to Pyongyang[25] to prepare for the planned Trump[26]-Kim[27] summit. North Korea[28] releases three Americans who

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