In the early 20th century, both Russia and Korea came into conflict with Japan. Following the end of the Russo-Japanese War in 1907, Russia enacted an anti-Korean law at the behest of Japan, under which the land of Korean farmers was confiscated and Korean labourers were laid off. However, Korean migration to Russia continued to grow; 1914 figures showed 64,309 Koreans (among whom 20,109 were Russian citizens). Even the 1917 Bolshevik Revolution did nothing to slow migration; in fact, after the repression of the 1919 March 1st Movement in Japanese-colonised Korea, migration actually intensified. Korean leaders in Vladivostok's Sinhanchon (literally, "New Korean Village") neighbourhood also provided support to the independence movement, making it a centre for nationalist activities, including arms supply; the Japanese attacked it on April 4, 1920, leaving hundreds dead. By 1923, the Korean population in the Soviet Union had grown to 106,817. The following year, the Soviets began taking measures to control Korean population movement to their territory; however, they were not completely successful until 1931; after that date, they halted all migration from Korea and required existing migrants to naturalise as Soviet citizens.