North Korea
Japan tried to suppress Korean traditions and culture and ran the economy primarily for its own benefit. Korean resistance groups known as Dongnipgun (Liberation Army) operated along the Sino-Korean border, fighting guerrilla warfare against Japanese forces. Some of them took part in allied action in China and parts of South East Asia. One of the guerrilla leaders was the communist Kim Il-sung, who later became the first leader of North Korea.
Foreign relations of North Korea
In 2018, North Korean leader Kim Jong-un made a sudden peace overture towards South Korea and the United States. This led to the first face to face-to-face discussion between the Supreme Leader of North Korea and a sitting United States President. This is known as the 2018 Korean peace process.