DUBAI - Iranian President Mahmoud Ahmadinejad said on Sunday Tehran would not negotiate about its disputed nuclear program under pressure, but would talk to its adversaries if they stopped "pointing the gun."In a speech to mark the 34th anniversary of the Islamic revolution, Ahmadinejad struck a more conciliatory tone than Supreme Leader Ayatollah Ali Khamenei, who on February 7 rebuffed a US call for direct negotiations on disputes between the two countries.Ahmadinejad does not have the authority to authorize negotiations over the nuclear program, which lies with Khamenei."You cannot point a gun at the Iranian nation and then expect them to have negotiations with you," Ahmadinejad said, speaking to a crowd gathered in Tehran's Azadi (Freedom) Square.