In 1866, Russia opened a consulate in Buenos Aires. Diplomatic relations between Argentina and Russia were established on 22 October 1885. Most Russian migrants arrived to Argentina between 1880 and 1921, in three waves. The first wave was caused by events such as the 1905 Russian Revolution; the second wave from the October Revolution of 1917 and the third wave caused by the Russian Revolution that took place between 1917 and 1922. In October 1917, Argentina suspended diplomatic relations with Russia as a result of its revolution. Diplomatic relations were restored with the Soviet Union soon after World War II in 1946.