Signed in 2010 between the United States and Russia, New START calls for continued reduction in nuclear forces. The United States and Russia possess over 90% of the world’s nuclear weapons. Under New START, the number of long-range deployed nuclear warheads held by both countries was reduced to the required limit of 1,550 and each country conducted more than 150 on-site inspections of the other’s facilities and exchanged military data.  If New START expires, there would be no legally binding, verifiable limits on the world’s two largest nuclear arsenals for the first time since 1972. Click here to learn more and to contact Congress.