Iran's Ambassador in Moscow Mehdi Sanaei said on Saturday that the recent regional summit in Tehran attended by Iran, Russia and Turkey indicated that regional problems can and should be resolved through collective cooperation. “The fact is that the real solution to regional problems is fighting terrorism based on regional potentials,” Sanaei said after Tehran's summit, IRNA reported. “We hope in the future other countries in the region reach the same conclusion in their bid to resolve disputes,” he said. The third visit by Russian President Vladimir Putin to Iran in four years indicates the expansion of all-out relations between the two neighbors, he said. Putin traveled to Iran to attend a three-way summit with President Hassan Rouhani and Turkish President Recep Tayyip Erdogan on Friday, which focused on the Syrian province of Idlib, the last stronghold of active opposition to the beleaguered government of President Bashar al-Assad.