Excerpts from Books and Wikipedia
"In 1910, an already militarily occupied Korea was a forced party to the Japan–Korea Annexation Treaty. The treaty was signed by Lee Wan-Yong, who was given the General Power of Attorney by the Emperor. However, the Emperor is said to have not actually ratified the treaty according to Yi Tae-jin. There is a long dispute whether this treaty was legal or illegal due to its signing under duress, threat of force and bribes. Korean resistance to the brutal Japanese occupation was manifested in the nonviolent March 1st Movement of 1919, during which 7,000 demonstrators were killed by Japanese police and military. The Korean liberation movement also spread to neighbouring Manchuria and Siberia. Over five million Koreans were conscripted for labour beginning in 1939, and tens of thousands of men were forced into Japan's military. Nearly 400,000 Korean labourers died. Approximately 200,000 girls and women, mostly from China and Korea, were forced into sexual slavery for the Japanese military. In 1993, Japanese Chief Cabinet Secretary Yohei Kono acknowledged the terrible injustices faced by these euphemistically named 'comfort women.'" [Wikipedia]