Japanese found the use of European single-handed sabers inadequate against Japan's larger Russian adversaries in the Russo-Japanese War (1905-5) and in 1933 re-instituted the two-handed saber as the official Japanese sidearm for officers and non-commissioned officers. Koreans associated with the Japanese such as Korean Police and Military Officers-in-training did likewise. With the occupation of Korea by Japan in 1910, Japanese sword practices increasingly supplanted Korean sword work in the urban areas. This was enhanced by the acceptance of Kendo in the Korean educational system in 1931 as well as a series of high-profile competitions between Korean and Japanese players during the 1930s and 1940s.