Ahead of the NPT review conference, the US has said the Indo-US civil nuclear deal has not weakened the Nuclear Non-Proliferation Treaty as the pact comes with a number of transparency mechanisms. Ellen Tauscher, Undersecretary of State for Arms Control, told a tele-conference with reporters in Washington and New York that it is a deal that comes with safeguards. Responding to a question on China-Pakistan deal on nuclear power plants, the US official refused to speculate but said that these things take a long time. Tauscher said the US is disappointed that Pakistan is blocking negotiations on the Fissile Material Cutoff Treaty.<br/>Officials of more than 180 countries will gather in New York next week for the once-in-a-five year NPT Review Conference.<br/>