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A chronology of major developments leading up to the second summit between U.S. President Donald Trump and North Korean leader Kim Jong Un in Hanoi:

1945: The Korean Peninsula is liberated from Japanese colonial rule after Tokyo surrenders at the end of World War II.

1948: The peninsula is divided into the Soviet-supported North and the U.S.-backed South.

1950: The Korean War begins.

1953: The Korean War ends in an armistice.

1985: North Korea becomes a signatory to the Nuclear Non-Proliferation Treaty.

1992: North and South Korea sign a joint declaration on the denuclearization of the peninsula.

1994: Jimmy Carter becomes the first former U.S. president to visit North Korea. The United States and North Korea sign the Agreed Framework, under which Pyongyang promises to freeze its nuclear program in return for aid.

2000: The first inter-Korean summit takes place in Pyongyang. U.S. Secretary of State Madeleine Albright visits North Korea.

2002: Japanese Prime Minister Junichiro Koizumi makes a historic visit to North Korea; Pyongyang admits to having abducted Japanese in the 1970s and 1980s.

2003: North Korea withdraws from the NPT. The first round of six-party nuclear talks, involving the Koreas, China, Japan, Russia and the U.S., is held in Beijing.

2005: North Korea declares it has nuclear weapons. The six countries adopt a joint statement that commits North Korea to giving up its nuclear program in return for energy aid and security assurances.

2006: North Korea conducts its first nuclear test.

2009: North Korea says it will quit the six-party talks and carries out its second nuclear test.

2011: Leader Kim Jong Il dies and is succeeded by his youngest son, Kim Jong Un.

2012: North Korea agrees to implement a moratorium on its nuclear and missile programs in return for food aid from the United States. But it effectively scraps the deal with a test widely seen as aimed at improving its missile capabilities.

2013: North Korea conducts its third nuclear test.

2014: North Korea test-fires a medium-range Rodong ballistic missile for the first time since 2009.

2015: North Korea says it will restart all of its nuclear facilities.

January 2016: North Korea claims to have conducted its first hydrogen bomb test.

May: The ruling Workers’ Party of Korea holds its first congress in 36 years.

September: North Korea conducts its fifth nuclear test.

January 2017: Kim says North Korea is in the final phase of preparing to test-launch an intercontinental ballistic missile.

June: North Korea releases an American university student who fell into a coma while imprisoned. He later dies.

July: North Korea claims its first successful test of an intercontinental ballistic missile.

August: Trump and North Korea begin to exchange increasingly fiery rhetoric.

September: North Korea conducts its sixth and most powerful nuclear test.

November: Trump announces the relisting of North Korea as a state sponsor of terrorism. North Korea announces its launch of a new ICBM capable of striking anywhere in the United States with a nuclear warhead and declares its nuclear force as complete.

Jan. 1, 2018: Kim says in his New Year’s address that North Korea is now “capable of thwarting and countering any nuclear threats from the United States.” He also offers to send athletes to the Winter Olympics in South Korea.

Jan. 4: South Korea and the United States agree to postpone their annual military drills until after the Olympics.

Jan. 9: North and South Korea hold their first official talks in more than two years in the truce village of Panmunjom.

March 25: Kim makes a surprise visit to China by train to meet with President Xi Jinping in Beijing, his first overseas trip and his first talks with a foreign leader.

April 9: Trump says he will meet Kim.

April 20: North Korea decides to shut down its only known nuclear test site, in Punggye-ri, and suspend ICBM tests.

April 27: Kim and South Korean President Moon Jae-in meet on the southern side of the truce village for the first inter-Korean summit in over a decade and agree to work toward “complete” denuclearization of the Korean Peninsula.

May 10: Trump says he will meet Kim in Singapore on June 12.

May 24: North Korea says its Punggye-ri site is “completely” dismantled. Trump cancels the scheduled summit with Kim.

May 26: Kim and Moon hold a surprise meeting on the North Korean side of the truce village after Trump revives hopes of the summit in Singapore.

June 1: Trump meets a high-ranking North Korean official at the White House and is handed a letter from Kim. Trump reinstates his summit with Kim for the original date in Singapore.

June 12: Trump and Kim meet in Singapore in the first summit between the sitting leaders of the United States and North Korea. They sign a joint declaration in which North Korea promises to work toward “complete denuclearization” of the peninsula and the United States pledges to provide security guarantees for Pyongyang.

Sept. 18-20: Kim and Moon meet for their third summit in Pyongyang. Kim tells Moon he is prepared to dismantle the North’s Nyongbyon nuclear complex.

Oct. 7: U.S. Secretary of State Mike Pompeo meets with Kim in Pyongyang.

Jan. 1, 2019: Kim says he is willing to meet Trump “anytime” and pledges not to make and test any more nuclear weapons.

Jan. 18: Kim Yong Chol, a close aide of Kim Jong Un, meets with Trump in Washington.

Feb. 6-8: Stephen Biegun, U.S. special representative for North Korea, visits Pyongyang.

Feb. 8: Trump says the second summit to be held in Hanoi.

Feb. 19: Trump says he is in “no rush” to denuclearize North Korea.

Feb. 27-28: Trump and Kim hold their second summit.

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