Some Nivkhs and Uilta who served in the Imperial Japanese Army were held in Soviet work camps; after court cases in the late 1950s and 1960s, they were recognised as Japanese nationals and thus permitted to migrate to Japan.
Beberapa Nivkh dan Uilta yang bertugas dalam Angkatan Darat Kekaisaran Jepang dibawa ke kamp-kamp kerja Soviet; setelah pengadilan pada akhir 1950an dan 1960an, mereka diakui sebagai warga negara Jepang dan diijinkan untuk bermigrasi ke Jepang.