The New START treaty is a nuclear arms reduction treaty between the United States and the Russian Federation that was signed on April 8, 2010, in Prague. It replaced the Treaty of Moscow (SORT), which was to expire in December 2012, and it follows the START I treaty, which expired in December 2009. The treaty caps the number of strategic nuclear warheads that the United States and Russia can deploy and places verifiable limits on all Russian deployed intercontinental-range nuclear weapons. The treaty allows both U.S. and Russian inspectors to ensure that both sides are complying with the treaty. The New START Treaty provides for 18 on-site inspections per year. The United States and the Russian Federation have agreed to extend the treaty through February 4, 2026. The treaty is composed of three tiers of increasing levels of detail: the Treaty text, the Protocol to the Treaty, and the Technical Annexes. All three tiers are legally binding.