You may be too young to know subject story of Svetlana Alliluyeva, the sole daughter of Stalin, the actual founder of fromer Soviet Union.  She defected from her motherland to United States in mid 60s, and the incident had been a sensational news in the time of Cold War: 

https://www.toutiao.com/article/7101139164594586152/?log_from=9e0622a327d4b_1653560333842