Complete the paragraph to name a cause for the Cuban Missile Crisis.

The Soviet Union stated that it was placing weapons in Cuba to ensure that Cuba would be safe from another US invasion like (Choices :the U-2 incident, the Bay of Pigs, Operation Mongoose).
The United States did not like the number of (Choices: short-range missiles, ballistic missiles, long range missiles) being transported to Cuba, but if the weapons were defensive, they could not be considered an act of aggression.