An advisor to the government of Manchukuo during the war, based in Dairen, Yasue became less and less involved in the Fugu Plan in any official capacity. He did, however, maintain contacts, and some involvement with the Jewish community in Shanghai which had been formed as a result of his actions. When the Soviet Union invaded Manchukuo in August 1945, just prior to the surrender of Japan and the end of the war, Yasue did not attempt to flee the mainland. He arranged a formal farewell to his family, in which he expressed his view that his entire generation was to blame for the war, and its outcome. He did not feel it would be honorable to flee from his responsibility, and so he allowed himself to be captured by the Soviet forces.