US has said it will not push India to sign the NPT and the CTBT for quite some time. It also appreciated New Delhi's responsible behaviour.<br/><br/>Robert J Einhorn, Special US Advisor on Non Proliferation and Arms Control, said the Obama administration appreciates and understands India ‘s principled opposition to the Nuclear Non-proliferation Treaty (NPT) treaty.<br/><br/>He said what's especially important to the US is that India has behaved in a responsible manner.<br/><br/>Einhorn told journalists that Washington wants India to work with it in strengthening the nonproliferation regime. India has refused to ink the NPT and CTBT saying they were "discriminatory" as it differentiates between the "have and the have-nots".<br/><br/>The top US official made it clear that the White House would not push India to sign Comprehensive Test Ban Treaty (CTBT) until it is ratified by the Senate. He said Senate ratification will follow discussions with India and other countries about how to bring this important treaty into force.<br/><br/>Einhorn said, US and India have increasingly become partners in this area of dealing with the global proliferation threat, with the threat of nuclear terrorism.