U.S. Secretary of State Mike Pompeo arrived in North Korea on Wednesday to finalize details of a planned summit between President Donald Trump and North Korea leader Kim Jong Un. A look at recent events in U.S.-North Korea relations: Jan. 1, 2017: Kim Jong Un says in a New Year's address that preparations for launching an intercontinental ballistic missile have "reached the final stage." Jan. 2: President-elect Donald Trump tweets, "North Korea just stated that it is in the final stages of developing a nuclear weapon capable of reaching parts of the U.S. It won't happen!" July 4: North Korea conducts its first flight test of an ICBM, the Hwasong-14, which Kim calls the North's "package of gifts" for the U.S.'s Independence Day. July 28: A second Hwasong-14 is launched with an estimated range reaching into the U.S. mainland, including cities such as Chicago. Aug. 9: Trump says North Korea had best not make more threats or "they will be met with fire and fury like the world has never seen." North Korea hours later announces a plan to launch a salvo of missiles toward the U.S. territory of Guam, a major military hub in the Pacific. The North does not carry out on the threat. Aug. 29: An intermediate-range North Korean missile flies over Japan and plunges into the northern Pacific. Sept. 3: North Korea carries out its sixth and most powerful nuclear test to date, saying it was a hydrogen bomb designed for use on ICBMs. Sept. 19: Trump tells the U.N. General Assembly the United States would "totally destroy North Korea" if forced to defend itself or its allies. He refers to Kim as "Rocket Man" and that he's "on a suicide mission for himself." Sept. 22: Kim accuses Trump of "mentally deranged behavior." He says he will "surely and definitely tame the mentally deranged U. S. dotard with fire." Nov. 29: North Korea's third ICBM test demonstrates a potential range that could reach Washington, D.C. Jan. 1, 2018: Kim says in his New Year's address that he has a nuclear button on his desk, but also calls for improved relations with South Korea. Trump soon responds that he has a bigger and more powerful nuclear button, "and my Button works!" Jan. 9: North and South Korean officials meet in the border village of Panmunjom, and agree on North Korea sending athletes and delegates to the Winter Olympics taking place in the South the following month. March 7: A top South Korean official visits Pyongyang and says Kim is willing to discuss the fate of his nuclear arsenal with the United States and has expressed a readiness to suspend nuclear and missile tests during such talks. March 9: Trump accepts Kim's invitation to meet, which the White House says will take place by the end of May. March 27: Kim makes a surprise visit to Beijing for a meeting with Chinese President Xi Jinping in an apparent move to strengthen his leverage ahead of his negotiations with Trump. April 18: Trump confirmed that Pompeo, then the CIA chief, secretly met with Kim in North Korea and said "a good relationship was formed" heading into the adversaries' anticipated summit. April 21: North Korea says it has suspended nuclear and long-range missile tests and plans to close its nuclear test site as part of a move to shift its national focus and improve its economy. Trump tweeted, "This is very good news for North Korea and the World" and "big progress!" April 27: Kim holds a summit meeting with South Korean President Moon Jae-in. May 7: Kim meets Xi again in China's Dailan and calls for stronger "strategic cooperation" between the traditional allies amid shifts in the region's political environment. May 9: Pompeo arrives in Pyongyang for meetings ahead of Trump's planned summit with Kim. The Kim-Trump meeting is anticipated for May or June.