Some ended up spending decades living in the Soviet Union , and could only return to Japan in the 1990s .
After the last major repatriation in 1956 , the Soviets continued to hold some POWs and release them in small increments .
Some ended up spending decades living in the Soviets   , and could only return to Japan in the 1990s .
After the last major repatriation in 1956 , the Soviets continued to hold some POWs and release them in small increments .