Operation Crossroads was the code name for 2 nuclear tests by the U.S. to create weapons of mass destruction after the World War 2 ending success with the Fat man and Little Boy Atom bombs. Bombs ABLE and BAKER designed after the bombs that dropped over japan in world war 2 were dropped over a fleet of captured ships over the World Wars.
The Soviet Bomb almost the exact same as the Fat Man bomb, Joe-1 a 22 kiloton atomic bomb was tested in Kazakhstan. The making of the bomb was aided by soviet spies inside of the Manhattan project (research and development of the first 2 atomic bombs created)
After the soviets successful bomb Edward Teller went on to create a bomb that would have hydrogen isotopes deuterium and tritium fuse with helium and it had no limit of the amount of destruction it could do, the Hydrogen Bomb was born. MIKE 10.4 Megaton hydrogen bomb was tested on the island Elugelab of the Enewetak atoll it vaporized and destroy many forms of life on surrounding islands. BRAVO the second test was a projected 5 megatons when it dropped 15 megatons was the result it was the biggest nuclear bomb that America has ever tested it vaporized three islands and more than 300 miles from Bikini was Utirik which had suffered radiation from the blast and 90% of all the people even children in 10 years had developed thyroid tumors. Bravo was 682 times the amount of the bomb that the Soviet's had tested.
After The Soviet Union attempt at their own hydrogen bomb test that was not as powerful as America's test Britain, France, and China all had their own test as well. The Soviets couldn't keep up with America and on April 26, 1986 the worst nuclear power accident happened at Chernobyl Nuclear Power Plant in the Soviet Republic of Ukraine shot radiation all over Europe, it destroyed miles upon miles of land and contaminated even more.
The USSR had placed missile on the island of Cuba which in the picture to the left the range made it possible of a strike on the U.S.