Mahmoud Ahmadinejad hosted the leaders of the two other Persian-speaking countries at a time when Iran is seeking to increase its influence in the region and NATO troops are struggling in Afghanistan.

A bete noire of the West over Iran's nuclear activities, Ahmadinejad said the three countries had all thrown off foreign domination in recent decades and should strengthen economic and security ties and be independent of big powers.

"Many don't find this desirable, three independent countries forming a powerful friendship in the region, and changing the current situation. None of them is happy about this," he said in part of the meeting.

Afghan President Hamid Karzai, who addressed the other leaders seated around a triangular table as "my dear brothers," has been trying to improve relations with Iran in recent months, to the occasional consternation of Washington.

Karzai welcomed Ahmadinejad to Kabul in March and said he will host him and Tajikistan's President Imomali Rakhmon at the next trilateral meeting in the Afghan capital.

Ahmadinejad called on foreign troops to leave the region and allow the three nations to develop closer bonds.

Karzai has been looking for allies in the region in advance of an eventual American withdrawal.