North Korea's deputy ambassador to the United Kingdom, Thae Yong-ho, defects with his family to South Korea.
- A North Korean soldier defects to South Korea after swimming across the Han River, the second North Korean defection in a week.
- A North Korean soldier crosses the Korean Demilitarized Zone (DMZ) and defects to South Korea, the first since September 2016.
- South Korea announces it will be raising its US$217,000 cash reward for classified information from North Korea by defectors to $860,000.
- A group of 13 North Koreans working at a restaurant in an unidentified country defect en masse to South Korea, according to Seoul's Ministry of Unification.
- North Korea accuses South Korea of kidnapping its citizens and demands their immediate return after Seoul's Ministry of Unification said 13 of them had defected to South Korea from China, where they worked in a Pyongyang-operated restaurant. China says that the 13 people, a male manager and 12 young female employees, had legitimate passports and had freely exited China.
- South Korea announces that a colonel from North Korea's military spy agency defected to the south last year. Senior-level defections are rare, most being low level operatives.
- The South Korean Ministry of National Defense states that a North Korean soldier has defected to South Korea after killing two of his superiors.
- North Korea test fires several missiles, believed to be anti-ship weapons. The test comes immediately after South Korea suspends further deployment of the THAAD anti-missile system.
- North Korea launches a Short-Range Ballistic missile near Wonsan towards the Sea of Japan, according to South Korea. The missile reportedly lands in Japan's exclusive economic zone (EEZ) after traveling 450 km.
- South Korea reports North Korea fired a Pukguksong-2 intermediate-range ballistic missile that flew 500 km before landing in the Sea of Japan.