India's first weapon test was in 1974 with Smiling Buddha. The sanctions occured in 1998, after the cold war, and India had already developed enough weaponry to

India's first weapon test was in 1974 with Smiling Buddha. The sanctions occured in 1998, after the cold war, and India had already developed enough weaponry to be a "no first use" country with triad capabilities (air, land, and sea). All that to say, they didn't depend on the US for knowledge like that.