Подчинение территории: как Советский Союз и его наследница Россия обращаются с ресурсами, людьми и природой
If "O Kadhal Kanmani" is not available on the platforms mentioned above, you might want to keep an eye on them as availability can change. Alternatively, consider reaching out to friends or family who might have a physical copy or subscription to a service that carries the film.