The first group of around 172,000 Koreans were deported by Soviet authorities from the Russian Far East to the Kazakh and Uzbek SSRs; around 10 to 25 percent died.

Koryo-saram or Koryoin are ethnic Koreans of the mainland former Soviet Union who descend from Koreans who lived in the Russian Far East.

The deportation of Koreans in the Soviet Union was the forced transfer of nearly 172,000 Koryo-saram from the Russian Far East to unpopulated areas of the Kazakh SSR and the Uzbek SSR in 1937 by the NKVD on the orders of Soviet leader Joseph Stalin and Chairman of the Council of People's Commissars of the Soviet Union Vyacheslav Molotov. 124 trains were used to resettle them 4,000 miles (6,400 km) to Central Asia. The reason was to stem "the infiltration of Japanese espionage into the Far Eastern Krai", as Koreans were at the time subjects of the Empire of Japan, which was the Soviet Union's rival. However, some historians regard it as part of Stalin's policy of "frontier cleansing". Estimates based on population statistics suggest that between 16,500 and 50,000 deported Koreans died from starvation, exposure, and difficulties adapting to their new environment in exile.

The Russian Far East is a region in North Asia. It is the easternmost part of Russia and the Asian continent, and is coextensive with the Far Eastern Federal District, which encompasses the area between Lake Baikal and the Pacific Ocean. The area's largest city is Khabarovsk, followed by Vladivostok. The region shares land borders with the countries of Mongolia, China, and North Korea to its south, as well as maritime boundaries with Japan to its southeast, and with the United States along the Bering Strait to its northeast.

The Kazakh Soviet Socialist Republic, also known as Soviet Kazakhstan, the Kazakh SSR, KSSR, or simply Kazakhstan, was one of the constituent republics of the Soviet Union (USSR) from 1936 to 1991. Being located in northern Central Asia, the Kazakh SSR was created on 5 December 1936 from the erstwhile Kazakh ASSR, which was an autonomous republic of the Russian SFSR. It shared borders with its fellow Soviet republics of Russia, Kyrgyzstan, Turkmenistan and Uzbekistan, while also sharing an international border with the People's Republic of China.