Democratic Republican Party (South Korea) combination of state and corporate chaebol power pioneered by the party continues to be deeply built into the foundations of the South Korean economic system. Following the promulgation in October 1972 of the Yushin Constitution, which implemented numerous authoritarian centralizing measures such as the direct appointment of a third of the National Assembly by the President, the DRP assumed an unprecedented level of political power. For the next eight years, South Korea was essentially a one-party state ruled by the DRP. After Park's assassination on 26 October 1979 and the seizure of power by Chun Doo-hwan in the coup d'état
South Korea alliance between the United States and Japan. Korea and Japan have had difficult relations since ancient times, but also significant cultural exchange, with Korea acting as the gateway between Asia and Japan. Contemporary perceptions of Japan are still largely defined by Japan's 35 year colonization of Korea in the 20th century, which is generally regarded in South Korea as having been very negative. Japan is today South Korea's third largest trading partner, with 12% ($46 billion) of exports in 2016. There were no formal diplomatic ties between South Korea and Japan directly after independence the end of World War II