A History of Sambo: Oshchepkov, Spiridonov and the Soviet Struggle
https://tinyurl.com/y8jyttu7
Vasili Oshchepkov was born in Sakhalin, Russia, in 1893 and became an orphan at only 8 years old. After the transfer of South Sakhalin to Japan under the Treaty of Portsmouth in 1905, Oshchepkov was sent to the Land of the Rising Sun to continue his studies two years later. After a few years studying traditional Japanese judo under St. Nicholas of Japan, Oshchepkov was sent to the famous Kodokan Judo Institute in 1911