START II (Strategic Arms Reduction Treaty) was a bilateral treaty between the United States and Russia on the Reduction and Limitation of Strategic Offensive Arms. It was signed by US President George H. W. Bush and Russian President Boris Yeltsin on 3 January 1993, banning the use of multiple independently targetable re-entry vehicles (MIRVs) on intercontinental ballistic missiles (ICBMs). Hence, it is often cited as the De-MIRV-ing Agreement.
It was ratified by the US Senate on 26 January 1996 with a vote of 87–4. Russia ratified START II on 14 April 2000, making it conditional on preserving the ABM Treaty. When the US withdrew from the ABM Treaty on 13 June 2002, Russia withdrew from START II one day later. Thus, START II never entered into effect.
Instead, SORT came into effect, which reduced the strategic warheads count per country to 1,700–2,200.