FILE – From left to right, former Russian leader Josef Stalin and Soviet politician Nikolai Bukharin are seen Nov. 21, 1930. North Korea’s execution of Kim Jong-un’s uncle suggests that the boyish leader has learned to wield their realpolitik playbook, ridding himself of one would-be rival and sowing fear among others who might challenge him. Stalin, Hitler and other of the 20th century’s most notorious dictators, methodically ousted opponents to brazenly seize and consolidate power. (AP Photo, File)