Thirty-four years ago today, on July 31, 1991 (June 20, 1991 lunar calendar), the United States and the Soviet Union reached the Strategic Arms Reduction Treaty. The negotiations between the United States and the Soviet Union on strategic arms reduction began in 1982 and went through 15 rounds, finally coming to an end in the context of the end of the Cold War. On July 31, 1991, US President Bush and Soviet President Mikhail Gorbachev reached an agreement during their meeting in Moscow and officially signed the treaty, called the Strategic Offensive Reduction Treaty. The treaty stipulates that the total number of strategic delivery vehicles (intercontinental missiles, submarine-launched ballistic missiles, and strategic bombers) possessed by each party shall not exceed 1,600, including no more than 154 heavy ballistic missiles; each party may retain 6,000 strategic nuclear warheads, including no more than 4,900 nuclear warheads for intercontinental and submarine-launched ballistic missiles, and no more than 1,100 nuclear warheads for strategic bombers. The treaty stipulates stricter verification measures and stipulates that the two sides will complete the disarmament task in three stages within seven years after the treaty enters into force. The conclusion of this treaty was the product of long-term bargaining between the United States and the Soviet Union, especially the great compromises and concessions made by the Soviet Union. It was a breakthrough in the field of nuclear disarmament between the United States and the Soviet Union, and contributed to reducing the level of nuclear confrontation between the two countries and reducing the threat of nuclear war. However, the reduced nuclear weapons of the United States and the Soviet Union are still enough to destroy each other many times, and they still have a long way to go in nuclear disarmament.