Mohamed Sahnoun first became diplomatic advisor of the Provisional Government of the Algerian Republic. In 1962 he travelled with president Ben Bella on his first official visit to the USA, where he met with president John Kennedy who had been one of the supporters of the cause of Algerian independence. As the Algerian delegation was then due to travel to Cuba, Kennedy showed Ben Bella the first secret pictures taken by U2 planes showing Russian missiles launch pads in Cuba. In the name of peace and human security, Ben Bella agreed to convey a message to Fidel Castro making clear how much the American regarded this situation as a "casus belli".