no spectacular progress was either achieved or pretended. >> and two months later khrushchev built the berlin wall, sealed off east berlin from west berlin, and kennedy did nothing. >> khrushchev goes one step further, testing even more powerful nuclear weapons. he shatters kennedy's hopes of slowing down the arms race. >> kennedy learned the soviets were not as committed as he was to avoiding war and that the world was in a very dangerous place. ♪ bum-bum-bum-bum-bum t-mobile believes it's better to give than to receive. james may disagree (scream) join t-mobile and get the samsung galaxy s9 free. ♪ bum-bum-bum-bum-bum