AFTER having co-sponsored the move along with the US for just such a pact in 1973, and then again in 1993, why is India now reluctant to sign the Comprehensive Test Ban Treaty (CTBT)? The official Indian line against signing on the dotted line at the Conference on Disarmament (CD)—which ends in Geneva on June 28—is that the treaty in its present form is discriminatory and does not address India's concerns. Also, New Delhi argues that with the end of the Cold War, its threat perception has changed.