Fan Casting War Band (1983)

An elite American commando is sent on a top-secret mission to destroy a separatist base in a remote and wild region of an Eastern European country. They quickly manage to eliminate the separatists and arrest their general, but they discover that their enemies were doing strange experiments. They had captured legendary creatures in Russian woods and were trying to make weapons of war out of them. These creatures have been freed from the dungeons by missile fire from the helicopters and they are out to exact revenge on any humans they find ! It should have been a routine mission, but now survival is an almost impossible quest for these soldiers who's face much stronger warriors !