The Iranian national flag is seen outside the International Atomic Energy Agency (IAEA) headquarters during the agency's Board of Governors meeting in Vienna on March 1, 2021. (Photo by JOE KLAMAR/AFP via Getty Images) WASHINGTON - The United States and Iran will talk with other world powers about returning to the Obama-era agreement that limited Iran’s nuclear program in exchange for the removal of crippling economic sanctions.The talks are expected to take place Tuesday in Austria, the Associated Press reported.