What limits did the Strategic Offensive Reductions Treaty set on U.S. and Russian strategic nuclear warheads?

The Strategic Offensive Reductions Treaty (SORT), also known as the Moscow Treaty, established limits on the number of strategic nuclear warheads held by the United States and Russia. Under the terms of the treaty, both nations were required to reduce their strategic nuclear arsenals to between 1,700 and 2,200 warheads by December 31, 2012.1

Unlike other arms control agreements, SORT did not mandate the elimination of specific delivery systems, nor did it require the destruction of warheads; it allowed nondeployed warheads to be placed into storage. For verification, the treaty relied on the mechanisms previously established in the START I agreement.1