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.
North Korea–South Korea relations
In 1998, South Korean President Kim Dae-jung announced a Sunshine Policy towards North Korea. Despite a naval clash in 1999, this led in June, 2000, to the first Inter-Korean summit, between Kim Dae-jung and Kim Jong-il. As a result, Kim Dae-jung was awarded the Nobel Peace Prize. The summit was followed in August by a family reunion. In September, the North and South Korean teams marched together at the Sydney Olympics. Trade increased to the point where South Korea became North Korea's largest trading partner. Starting in 1998, the Mount Kumgang Tourist Region was developed as a joint venture between the North Korean government and Hyundai. In 2003, the Kaesong Industrial Region was established to allow South Korean businesses to invest in the North. In the early 2000s South Korea ceased infiltrating its agents into the North.