Open Culture explains the existence of this unlikely film clip:
The year was 1967. Russell was by then a very frail 95-year-old man. Besides finishing work on his three-volume autobiography, Russell was devoting much of his remaining time to the struggle for peace and nuclear disarmament. To that end, he sometimes made himself available to people he thought could help the cause ... So when he was asked to appear in a movie called Aman, about a young Indian man who has just received his medical degree in London and wants to go to Japan to help victims of the atomic bombings at Hiroshima and Nagasaki, Russell said yes.