US President Barack Obama on Wednesday urged Iran to seize the "historic opportunity" of reaching a deal with world powers on its contested nuclear program in a speech at the United Nations.
"America is pursuing a diplomatic resolution to the Iranian nuclear issue, as part of our commitment to stop the spread of nuclear weapons and pursue the peace and security of a world without them," he told the General Assembly.
"This can only happen if Iran takes this historic opportunity," Obama added.
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"My message to Iran's leaders and people is simple: do not let this opportunity pass. We can reach a solution that meets your energy needs while assuring the world that your program is peaceful."
Western powers fear that Tehran is using its nuclear program as a cover to develop nuclear weapons. Iran says it has only peaceful intentions.
Talks between Iran and six powers, known as the P5+1 -- Britain, China, France, Russia, the United States and Germany -- are currently at a critical juncture.
The negotiations have only two months left to overcome hurdles in the way of a deal on curbing Tehran's nuclear program.