Which of these focused attention on the nuclear arms race between the united states and the soviet union? the vietnam war the berlin airlift the moon landing the cuban missile crisis and explain why ?

The Cuban Missile Crisis. The fear on both sides was that someone would push a button and all out war (perhaps the end of the planet as we understand it) would result. Both countries had ICBMs but America's were better. They could hit Russia. Russia had no real answer and Cuba is too small a defensive position. So Khrushchev blinked and took his threat home. It didn't take her long to catch up but by that time the political situation altered.

Ialso think the answer to this is korean