of the nuclear arms race … and to nuclear disarmament . (5) Bipartisan United States global leadership has curbed the growth in the number of countries possessing nuclear weapons and has slowed overall vertical proliferation among countries already possessing nuclear weapons, as is highlighted by a more than 90 percent reduction in the United States nuclear weapons stockpile from its Cold War height of 31,255 in 1967. (6) The United States testing of nuclear weapons is no longer necessary as a result of the following major technical developments since the Senate’s consideration of the Comprehensive Nuclear-Test-Ban Treaty (commonly referred to as the CTBT ) in 1999: (A) The verification architecture of the Comprehensive Nuclear Test-Ban-Treaty Organization (commonly referred to as the CTBTO )— (i) has made significant advancements, as seen through its network of 300 International Monitoring Stations and its International Data Centre, which together provide for the near instantaneous detection of nuclear explosives tests, including all 6 such tests conducted by North Korea between 2006 and 2017