Tehran, Aug 5, IRNA -- Tripartite meeting of President Mahmoud Ahmadinejad, President Hamid Karzai and President Imomali Rakhmon began here Thursday evening on ways to develop economic and regional cooperation. They discuss ways to develop economic, cultural and regional cooperation between the three Persian-speaking countries and the international campaign against terrorism.

Afghan President Hamid Karzai arrived in Tehran Thursday morning to attend the summit of leaders of Iran, Tajikistan and Afghanistan.

Development and all-out cooperation between the three Persian-speaking countries are on the agenda of discussion between the three presidents.

Implementation of the economic projects and construction of railway linking the three countries are also on the agenda.

The first tripartite summit of leaders took place in Dushanbe in 2006.

They also held talks on the sidelines of Shanghai Summit in 2008.

Their later meeting took place in Mazar-e Sharif in 2009.

President Karzai is accompanied by Afghanistan's Foreign Minister Zalmay Rassoul, National Security Advisor Rangin Dadfar Spanta and Minister of Finance Omar Zakhilwal.

The Tajik delegation headed by President Rakhmon included Foreign Minister Hamrokhon Zarifi, and Minister of Energy and Industries Alamjan Babaev.

© IRNA 2010