Moscow, June 07: Russian President Vladimir Putin signed the ratification bill for a sweeping Nuclear Arms Reduction Treaty with the United States, the Kremlin said today. The treaty of Moscow, signed by Putin and US President George W Bush in May 2002, requires each country to reduce their nuclear arsenals by two-thirds, to 1,700 to 2,200 warheads, by 2012. The US senate ratified the treaty in March, but the Russian Parliament postponed ratification because of Moscow's opposition to the US-led war in Iraq. Both houses of Parliament finally approved the accord last month at Putin's urging, and Putin and Bush formally exchanged ratification documents at their summit on Sunday. Critics of the agreement say it lacks teeth because it allows each country to stockpile warheads instead of destroying them. It also allows Russia to retain soviet-built missiles equipped with multiple nuclear warheads. They were to be scrapped under the earlier Start II Arms Reduction Treaty, which Russia never ratified. Bureau Report