Massive Retaliation is the threat of using nuclear weapons against the Soviets if they tried to seize a country not occupied by them and/or tried to expand there country by force. While Brinkmanship was the threat of using nuclear weapons to get an opposing country to back down/consed, Eisenhower used these effectively in the Korean war but there were saw as too dangerous.He used these to easily dispose of the Korean threat by threatening the use of nukes, and all the while, kept communism from spreading into Korea.