Final answer:
Alexander Dubček and Imre Nagy both attempted significant reforms in Czechoslovakia and Hungary respectively, but their efforts were thwarted by Soviet military action.
Step-by-step explanation:
Alexander Dubček and Imre Nagy were similar in that they both made serious efforts to improve their countries. Dubček, in 1968, initiated economic reforms and ended government censorship in Czechoslovakia, an action that was met with resistance from the Soviet Union leading to an invasion to reverse these reforms. Similarly, Nagy, during the Hungarian Revolution of 1956, advocated for national sovereignty and implemented reforms which were ultimately crushed by Soviet military intervention.