Diplomats from six world powers are set to meet at the United Nations as the U.S. continues to push for another round of sanctions against Iran's nuclear program.
Ambassadors from the five permanent U.N. Security Council members -- Britain, China, France, Russia and the United States - along with Germany, are scheduled to meet in New York Wednesday to discuss possible sanctions.
Meanwhile, Iranian President Mahmoud Ahmadinejad has called on U.S. President Barack Obama to stop threatening Iran.
In an interview with Iranian state television, Mr. Ahmadinejad said he has sent a letter to President Obama, the content of which he said will be made public soon.
President Ahmadinejad also said Iran is Mr. Obama's "only chance" of achieving foreign policy success.
President Obama has been working to garner international support for a fourth round of U.N. sanctions against Tehran.
Tuesday in Washington, Mr. Obama urged the international community to move "quickly and boldly" on a new set of sanctions.
Earlier this week at the nuclear security summit in Washington, White House officials said China is seriously considering new sanctions against Iran, and has assigned officials to participate in U.N. sessions on a new sanctions resolution. But China said Tuesday it wants dialogue with Iran to continue and only supports sanctions if diplomacy fails.
China, one of the five permanent members of the U.N. Security Council, has been reluctant to support tough sanctions on Iran.
The U.S. and its Western allies accuse Iran of working to create nuclear weapons. Iran says its atomic program is peaceful.
Some information for this report was provided by Reuters.