"Before the enemies touch the trigger, Iran's armed forces will cut off their hands," Ahmadinejad said, according to the state-run IRNA news agency.
His comments came after Iran intensified tensions in the nuclear standoff by conducting two days of missile tests, which included the firing of a missile whose range it says includes Israel.
"This is only a small part of Iran's defence capabilities and in future we will unveil more of our defence capabilities if it is needed," Ahmadinejad said.
The United States and its regional ally Israel have never ruled out a military attack to end Iran's controversial nuclear work, which the West fears could be used to make weapons — a charge vehemently denied by Iran.
There has been concern an attack against Iran could be imminent after it emerged Israel had carried out manoeuvres in Greece that were effectively dry runs for a potential strike against Iranian nuclear facilities.
