Cuban Missile Crisis
The very next day, a second letter was sent from Russia to Kennedy. This one looked more official than the first. It also said that the US must take its nuclear missiles out of Turkey if they wanted Russia to take their missiles out of Cuba. This would have been a fair trade because the US missiles in Turkey were close enough to Russia that they could reach most of the important cities and Cuba was close enough to the US that the Russian missiles would reach most of the important US cities. The problem for Kennedy was that he could not publicly agree to remove the US missiles from Turkey because Turkey would then not be protected and would not be happy.