Iranian President Hassan Rouhani said Russia played a 'very constructive role' in forming the Joint Comprehensive Plan of Action (JCPOA) while speaking during a meeting with his Russian counterpart Vladimir Putin at the Shanghai Cooperation Summit (SCO) in Qingdao on Saturday. He went on to say that 'more significant' dialogue between Russia and Iran is necessary after the 'illegal' withdrawal... Еще of the United States from the nuclear deal. Putin said that Russia and Iran are 'successfully cooperating' to resolve Syrian crisis and there are 'concrete results.' This year’s two-day summit marks the 18th edition and is set to include Pakistan and India as full members after they joined at Astana 2017. The leaders of all eight member states, four observer states, and heads of international organisations will be in attendance. The Shanghai Cooperation Organisation accounts for almost half of the world’s population, more than 20 percent of global GDP and over 60 percent of the Eurasian landmass, making it the largest regional organisation in the world.