Nothing else explains Obama's switching sides and helping the Jihadists
Here is a explanation that seemed valid to me. This is from bendog.
First, the EU was not for strengthening sanctions, so that was not a possibility, because we do not control them. France was probably the most hawkish, and the "deal" seems to be better than the minimum they needed to sign off.
And yes, I think Iran will largely comply because it really wants the sanctions lifted and to improve its economy. However, I think it will be at best difficult to keep them from giving more financial support to Hamas and Hezbollah. And, military sales from Russia can resume in, I think, five years. And it's very possible they will give terrorists things like anti-aircraft weapons. And, at the end of ten years or so, Iran may at least threaten to build a nuclear weapon.
But, the choices were pretty basic in that we do a deal, and this is the only deal, or we bomb them ... and not only would that be illegal and probably result in them sending terrorists to America, it would not have ended Iran's ability to build a nuclear weapon. So, it seems to me, the choice was take the best of imperfect choices