Yes US can stop supply and even impose sanctions. SO WHAT? Is India not in the same position today? When India exploded in 1997 US did impose sanctions but later withdrew them. India is too big and responsible power for US to do that. If US stops other countries, France & Russia will supply.
Deal should be analyzed with this simple approach:
1. Would India be worse off than today, or 2. Same as today, or 3. Better off.
Worst case scenario: Same as today. Best case scenarion: Better off by conserving present supply for weapons and import for energy.
