There are no changes regarding U.S. economic sanctions on Tehran, Assistant Secretary for Bureau of European and Eurasian Affairs Philip H. Gordon said when commenting on Washington's attitude over an energy deal signed between Turkey and Iran.

"The United States doesn't do economic business with Iran, and we also don't think it's time for business as usual with Iran for other countries. We also have legislation that requires sanctions when other countries make significant investments in Iran's energy sector, and none of that has changed," he said, Anatolian News agency reported.