From Spring to Summer (1988)

Set during World War 2, a female Russian soldier named Masha is on a mission to discover a secret Japanese base in Korea. Everybody who accompanies her on the mission shortly dies, and she is forced to stay with a local fisherman. Masha tries to get the information about the base location back to the Russian army; if she doesn't, the Japanese will unleash the "Sakura Plan" (an all-out biological warfare assault on the world).