I did not read 99% of the posts about the nuclear deal. Now can someone educate me on the clauses of the NSG waiver and 123 about what happens if and when India tests.
IIRC, the "law" of the US kicks in and bans cooperation, not just in nuclear but in all things technical. It's 1974 and 1998 all over again.
The IAEA deal is shown here, the US-India agreement is not there, sorry.
BUT.. POTUS can make a determination that the test was justified by the security environment that India faced - and then say

to the "law".
Otherwise, not only will the US not cooperate, but the US is "supposed to" use all its influence to get others to non-cooperate too, namely the NSG. Presumably will embargo all pending transactions/ exports to India of technical stuff including those made in India and just visiting US (remember the LCA augmented-stability actuators?), put all organizations involved in anything more technical than money-counting on the Entity List, cancel visas of visiting / desiring-2-visit Babus, probably cancel Space cooperation, demand return of any US-origin fuel/ equipment/instrumentation etc. Likewise pressure Poodles etc. to fall in line.
Generally a bissing match. So everything depends on the POTUS' mood. And no one is betting that BO will make any such enlightened "finding".
IOW, in all the above tamashas, if the main effect of the

is that the embargoers step on their own Little Cheneys, then there will be a magical "finding" by WHOTUS, citing "full consultation with our Strategic Partner". Or, Frogistan and Dera Vodka Khan will continue as if nothing happened, Helgastan will become very

, Kangaroostan will get huge shyness, Japan will

, UQ will cheat as always, but nothing else very special will occur.
BTW, not to derail the fine ro-dho here, but isn't the most likely situation that:
1. India weaponized as fast as possible after the 1990 tamashas. Including boosted-fission and even full Surya payloads.
2. The scientists kept pleading for SOME test, ANY test, because they were being forced to fly blind. Denied in 1990, denied in 1995.. so they scrambled the best they could to do simulations and analyses, and got very far ahead, digging wherever they could for data and the best in simulation/ subcritical testing ideas. The simulations accordingly became very sophisticated, because for once, the nation's survival depended on those, and the leaders were sympathetic to the scientists' predicament, and very scared, but powerless to order the testing.
3. So when the testing was authorized, it was done under extreme constraints, so the tests were designed to cause the absolute minimum detectable havoc. There was NO mandate to do a "Look How Big My Little Cheney Is!" demo. The opposite was true - they were asked to keep things as lo-lo-profile and SDRE as possible, consistent with THEIR being able to measure the data - and no one else.
4. They succeeded, and the nationalists of the day, through very careful analysis, confirmed that things had succeeded, in the face of worldwide yada-yada-yada.
5. Today , several of the same nationalists - AND former insiders - see some profit in going yada-yada-yada themselves. Different motives, 2 b sure. And probably, in the case of the insiders, with approval from the govt saying: "Look, if you can build enough of a case we'll be able to say " no CTBT without a series of hi-profile demo tests - will POTUS do the necessary finding? If so, u r looking at India enabling CTBT and FMCT and a "firm, written, time-bound" process towards Disarmament getting underway""
Are the NPAs smart enough to see that? Have the NoKo and Eyeran experiences taught them anything? Did the GeorgianMusharraf experience teach them anything? Is China finally beginning to scare them?
I find nonprollotullah Milhollin's comments to be quite surprising and enlightened, coming from a nonprollutullah.