Although China and North Korea have maintained close diplomatic relations in the past, the relationship has declined in recent years. Unprecedented border controls on the south of the Jilin Province in China reflect the atmosphere: Apart from passports, travelers must hand in all their devices and luggage for an exhaustive, lengthy inspection.

Despite all the restrictions, a viable connection to China is vital for North Korea. A new bridge over the Yalu river, which divides the two countries, is supposed to replace the derelict Sino-Korean Friendship Bridge that covers 70 percent of all bilateral trade. Construction on the North Korean side has stopped due to lack of finance in spite of Chinese private investments.

North Hamgyong Province, which borders with Russia and China, was hit by massive flooding last year that damaged or washed away barbed wire fences that prevent North Koreans from defecting or smuggling goods. It did not take long for the local administration to start building new fences and deploying guards to the border areas who are under orders to shoot any possible defectors on site.

The number of North Korean defectors has been decreasing for several years in a row, but it is still a sensitive subject for the regime. The photo above shows a South Korean television celebrity Lim Ji Hyun (Jeon Hye Song by her real name) who returned to North Korea under suspicious circumstances and made a public statement in July on the local propaganda TV channel about the "hell in the South."

Many North Korean defectors return to their country after their families are detained or blackmailed. Following a recent report, the regime has dispatched agents to border regions in China to locate and kidnap defectors. The abduction teams stay in the Jiangbin International Hotel and Life's Business Hotel in Dandong, the release stated.

Even though it is impossible for its inhabitants to leave North Korea, the country invites foreign tourists to discover the many attractions of the country. The official North Korean travel agency even launched its international website in August, offering trips to various parts of North Korea and even theme tours focused on architecture, biking, sports or - as cynically as it sounds - labor.

In 2016, US student Otto Warmbier was arrested for allegedly stealing a propaganda poster as a "trophy." He was sentenced to 15 years of hard labor for "crimes against the state." In June 2017, he was returned by North Korea to the US in a coma and died a week later. What happened to him in captivity is a mystery. His death prompted a ban on US citizens traveling to North Korea.

Kim Dong Chul, a South Korea-born US citizen, was sentenced in 2015 to 10 years hard labor for "subversion and espionage" after North Korean officials said he received a USB stick containing nuclear-linked and military secrets from a South Korean source in North Korea. Chul was arrested while visiting the special economic zone of Rason. He remains imprisoned and his condition is unknown.

In 2013, North Korea sentenced US citizen Kenneth Bae to 15 years hard labor for "crimes against the state." He was arrested while on a tour group in the port city of Rason. A North Korean court described Bae as a militant Christian evangelist. He was allowed to talk to the media once, and said he was forced to work eight hours a day and was in poor health. Bae was released in November 2014.

In 2013, US citizen Matthew Miller was arrested when he arrived in Pyongyang and reportedly tore up his US passport, demanding asylum in North Korea. He was later sentenced to six years of hard labor on charges of espionage. The court said Miller had a "wild ambition" to experience prison life so that he could secretly investigate North Korea's human rights situation. He was released in 2014.

In 2013, Merrill Newman an 85-year-old Korean War US Army veteran, was detained for one month in North Korea. Arrested as he was departing, he was accused of "masterminding espionage and subversive activities." He was freed after he expressed "sincere repentance" and read a statement that said he was "guilty of a long list of indelible crimes against the DPRK government and Korean people."

US journalists Euna Lee and Laura Ling were captured in 2009 after briefly entering North Korea to report on refugees. After a month in confinement, they were sentenced to 12 years hard labor for "illegal entry and "hostile acts." Two months later, after former US President Bill Clinton met with former North Korean leader Kim Jong Il in Pyongyang, the two women were pardoned and freed.

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.