Ahmadinejad also said he did not take seriously the threat that Israel could launch a military strike on Iran's nuclear facilities, denied sending arms to Syria, and alluded to Iran's threats to the life of British author Salman Rushdie.
The United States quickly dismissed the Iranian president's comments as "disgusting, offensive and outrageous."
Israeli Prime Minister Benjamin Netanyahu has hinted Israel could strike Iran's nuclear sites and criticized U.S. President Barack Obama's position that sanctions and diplomacy should be given more time to stop Tehran from acquiring nuclear weapons.
Iran denies it is seeking nuclear arms and says its atomic work is peaceful and aimed at generating electricity.
"Fundamentally we do not take seriously the threats of the Zionists," Ahmadinejad, in New York for this week's U.N. General Assembly, told reporters. "We have all the defensive means at our disposal and we are ready to defend ourselves."
Ahmadinejad is due to speak at the U.N. General Assembly on Wednesday. U.N. Secretary-General Ban Ki-moon met Ahmadinejad on Sunday and warned him of the dangers of incendiary rhetoric in the Middle East. Read more.....