The sanctions lifting deal with Iran and the major western powers is not without risk but it does one key thing that is crucial. It provides a road map for one of the biggest players in the region to head away from state sponsored terrorism and towards an improved if not normal coexistence with its neighbours, who have different faiths and creeds. This is vital for the future.
A fuller explanation of the deal is here:
The commons debated this in detail last year and my speech is here: http://guyopperman.blogspot.co.uk/2014/11/iran-debatemy-speech-powerful-speeches.html
I have no doubt that this is the right thing that the western powers, led by Obama, have done. I support it wholeheartedly.