Iran president says nuclear deal opens 'new horizons'
In a message on his Twitter account, Rouhani said the successful talks had shown "constructive engagement works."
I thank the Iranian diplomats, lawyers & nuclear scientists whose extraordinary efforts have brought about this victory. #IranDeal— Hassan Rouhani (@HassanRouhani) July 14, 2015
There can now be "a focus on shared challenges", he added, alluding to Sunni Muslim extremists of the Islamic State group, who from their base in Iraq and Syria are launching attacks on both Shiite and Western targets worldwide.