North Korean leader Kim Jong Un said in his New Year’s address that his country was in the "final stages" of launching an intercontinental ballistic missile (ICBM). US President-elect Donald Trump, whose inauguration was set for January 20, said on Twitter: "North Korea just stated that it is in the final stages of developing a nuclear weapon capable of reaching parts of the US. It won't happen!"

North Korea tested its first ICBM — the Hwasong-14 — on US Independence Day. Kim reportedly told his scientists that "the US would be displeased" by the launch. This, he said, was because "it was given a 'package of gifts' ... on its 'Independence Day.'" Trump wrote on Twitter in response: "North Korea has just launched another missile. Does this guy have anything better to do with his life?"

Pyongyang tested its second Hwasong-14 weeks later. Experts estimated the new rocket could reach the US mainland. Trump lashed out at North Korean ally China, writing in a Tweet: "I am very disappointed in China. Our foolish past leaders have allowed them to make hundreds of billions of dollars a year in trade, yet they do NOTHING for us with North Korea, just talk."

Trump appeared to threaten swift military action against Pyongyang when he told reporters: "North Korea best not make any more threats to the United States. They will be met with fire and fury like the world has never seen." North Korea responded by threatening to fire a medium-range ballistic missile into the waters around Guam, a US territory in the Pacific Ocean. It did not follow through.

Pyongyang sparked international outcry when it test-launched a mid-range ballistic missile — the Hwasong-12 — over Japan. The UN Security Council unanimously condemned the test. Trump said in a White House statement: "Threatening and destabilizing actions only increase the North Korean regime’s isolation in the region and among all nations of the world. All options are on the table."

North Korea announced it had successfully tested its sixth nuclear weapon. Pyongyang said it was a powerful type of nuclear weapon called a hydrogen bomb and that it could be placed on top of a ballistic missile. Trump wrote on Twitter: "The United States is considering, in addition to other options, stopping all trade with any country doing business with North Korea."

In his first speech at the United Nations, Trump called North Korea a "rogue state" and said Washington "will have no choice than to totally destroy North Korea" if Pyongyang failed to stop its nuclear weapons program. Referring to Kim, he added: "Rocket man is on a suicide mission for himself and his regime." Kim called Trump a "mentally-deranged US dotard" two days later.

North Korea test-fired its third ICBM of 2017. Pyongyang claimed it was a new missile, the Hwasong-15, which was superior to the Hwasong-14 and could hit any target on the US mainland. The US urged allies, including Germany, to break diplomatic ties with North Korea. Berlin ignored the call. Trump also called Kim a "sick puppy."

Kim said in his 2018 New Year's address that the North had completed its nuclear weapons program and that a "nuclear button" was on his desk at all times. Trump wrote two days later on Twitter: "Will someone from his depleted and food starved regime please inform him that I too have a Nuclear Button, but it is a much bigger & more powerful one than his, and my Button works!"

South Korean President Moon Jae-in welcomed Kim's sister, Kim Yo Jong, at the presidential house in the South Korean capital. She handed a letter to Moon inviting him to meet the North Korean leader in Pyongyang. Tensions appeared to be thawing. Seoul and Pyongyang had already agreed to send a unified hockey team to compete at the Winter Olympics in Pyeongchang, South Korea.

South Korean National Security Adviser Chung Eui-yong led a delegation on March 5 to Pyongyang to discuss the potential for peace talks. The next day, Chung said both sides had agreed to hold a joint summit in April and set up a telephone hotline between the two capitals. He also said Pyongyang would agree to stop its nuclear weapons and missile tests if the US agreed to hold talks with the North.

Chung flew on to Washington, D.C. to speak with Trump. After the meeting, Chung told reporters the US president had agreed to meet Kim by May. Trump later wrote on Twitter: "no missile testing by North Korea during this period of time. Great progress being made but sanctions will remain until an agreement is reached. Meeting being planned!" Foreign leaders welcomed the historic breakthrough.

A week before the scheduled meeting at the border between South Korean President Moon Jae-in and North Korean leader Kim Jong Un, Moon said North Korea wanted "an end to the hostile relations" and had expressed a commitment to "complete denuclearization" of the peninsula. The next day, the telephone hotline was connected for the first time since February 2016, so Moon and Kim could talk directly.

Kim announced North Korea would stop nuclear and missile tests. Kim said: "We no longer need any nuclear test or test launches of intermediate and intercontinental range ballistic missiles, and because of this the northern nuclear test site has finished its mission." However, no mention was made of its stored nuclear materials and equipment.

Kim and Moon Jae-in meet in the border town of Panmunjom in the Demilitarized Zone (DMZ) that has divided the two Koreas since the Korean War in 1953. The two leaders vowed to work towards a nuclear-free Korea and pledged an end to war. It was the first time a North Korean leader had set foot across the border since the 1950s and paves the diplomatic way for a Trump-Kim meeting in May or June.

South Korea announces its propaganda loudspeakers are to be switched off for good. They had been silenced temporarily ahead of the inter-Korean summit, which prompted the North to halt its broadcasts, too. Pyongyang also said it would adjust its time zone to that of the South as a symbolic gesture. North Korea has been half an hour behind the South since 2015.

After North Korea slammed US Vice President Mike Pence for comparing North Korea and Libya, Donald Trump abruptly canceled the summit. Trump said the move was due to "tremendous anger and open hostility" displayed by Pyongyang.

A day after scrapping the summit, Trump suggested he was still open to meeting Kim. US and North Korean officials met during the following week and on June 1, Trump met one of Kim's closest aides, Kim Yong Chol, in the White House. Shortly thereafter, Trump said the summit would indeed take place on June 12 in Singapore. "I think you're going to have a very positive result in the end," he said.

Trump and Kim met in Singapore as planned. They smiled, shook hands and praised how far they had come in overcoming their previous animosity. The summit ended with both leaders signing a short joint declaration that committed Pyongyang to denuclearize and the US to providing unspecified "security guarantees" to the North. Trump also said he would invite Kim to the White House.

Kim Il Sung, the first and "eternal" president of North Korea, took power in 1948 with the support of the Soviet Union. The official calendar in North Korea begins with his birth year, 1912, designating it "Juche 1" after the state's Juche ideology. He was 41 when, as shown here, he signed the 1953 armistice that effectively ended the Korean War.

In the years and decades after the war, Pyongyang's propaganda machine worked hard to weave a mythical narrative around Kim Il Sung. His childhood and the time he spent fighting Japanese troops in the 1930s were embellished to portray him as an unrivaled military and political genius. At the 1980 party congress, Kim announced he would be succeeded by his son, Kim Jong Il.

In 1992, Kim Il Sung started writing and publishing his memoirs, entitled "Reminiscences: With the Century." Describing his childhood, the North Korean leader claims that he first joined an anti-Japanese rally at 6 years old and became involved with the independence struggle at 8. The memoirs remained unfinished at Kim Il Sung's death in 1994.

After spending years in the top tiers of the regime, Kim Jong Il took power after his father's death. Kim Jong Il's 16-year rule was marked by famine and economic crisis in an already impoverished country. However, the cult of personality surrounding him and his father, Kim Il Sung, grew even stronger.

Historians outside North Korea believe Kim Jong Il was born in a military camp in eastern Russia, most likely in 1941. However, the leader's official biography claims it happened on the sacred Korean mountain Paektu, exactly 30 years after his father, on April 15, 1942. A North Korean legend says the birth was blessed by a new star and a double rainbow.

Kim Jong Il had three sons and two daughters with three different women. This 1981 photo shows Kim Jong Il sitting besides his son Kim Jong Nam, with his sister-in-law and her two children in the background. Kim Jong Nam was eventually assassinated in 2017.

In 2009, Western media reported that Kim Jong Il had picked his youngest son, Kim Jong Un, to take over as the head of the regime. The two appeared together at a military parade on 2010, a year before Kim Jong Il passed away.

According to Pyongyang, the death of Kim Jong Il in 2011 was marked by a series of mysterious events. State media reported that ice snapped loudly at a lake on the Paektu mountain during a sudden snowstorm, with a glowing message appearing on the rocks. After Kim Jong Il's death, a 22-meter (72-foot) statue of him was erected next to the one of his father (l.) in Pyongyang.

Kim Jong Un mostly stayed out of the spotlight before his ascent to power. His exact age is disputed, but he is believed to have been born between 1982 and 1984. He was reportedly educated in Switzerland. In 2013, he surprised the world by meeting with former NBA star Dennis Rodman in Pyongyang.

Like the leaders before him, Kim Jong Un is hallowed by the state's totalitarian regime. In 2015, South Korean media reported about a new teacher's manual in the North that claimed Kim Jong Un could drive at the age of 3. In 2017, state media said that a monument to the young leader would be build on Mount Paektu.

Altough Kim took power at a younger age and with less of a public profile than his father and grandfather, he has managed to maintain his grip on power. The assassination of his half-brother Kim Jong Nam in 2017 served to cement his reputation abroad as a merciless dictator. The North Korean leader has also vastly expanded the country's nuclear arsenal.