The tripartite summit of Pakistan, Iran and Afghanistan began here Sunday at Iranian capital with the leaders of the three countries vowing to play a role of good neighbors for each other, report said. Inaugurating the summit, Iranian President Mehmood Ahmedinejad said that the three countries share a common culture, religion and values, terming his country the second home of Afghanistan and Pakistan. He said that the region is facing problems like extremism, militancy and foreign interference and urged to enhance trilateral cooperation among the countries to tackle the issues. If we failed to cope these challenges our future generations will never forgive us, he said. Iranian President said that the foreign armies were present in the region for their own sake. He also announced that the next summit of the three countries would be held in October this year in Islamabad. Addressing the inaugural session of the summit, President Asif Ali Zardari said that Pakistan and Afghanistan both are facing security-related issues in their border areas, maintaining that the two countries are capable enough to understand and tackle the complexity of the issue.