Tonton Streaming Benson (1979) S1E18 - Checkmate

An 11 year old Soviet is brought to the mansion for a professional chess tournament. While the boy is homesick and wanting to be out of the public's eye, he sees Katie who hides him in her room. All hell breaks loose when the Soviets can't find him and accuses the US staff of kidnapping him. The Soviets then threaten war if the boy is not returned.