Yom Kippur War
The United Nations passed a resolution in the UN Security Council that asked all countries to bring a temporary stop to the war (called a 'ceasefire'). Both the Arab countries and Israel agreed, but the ceasefire failed since Israeli army advanced south to reach Suez. Brezhnev said to Nixon that if the US did not send troops, he would send Soviet troops to the area. The US believed that was a threat and so it put its military on full nuclear alert. That was the closest that both superpowers, the United States and the Soviet Union, had been to nuclear war and World War III since the Cuban Missile Crisis in the 1960s