Iran said new sanctions imposed by U.S. President Donald Trump on Wednesday break the terms of its nuclear deal with the United States and other world powers, and vowed an "appropriate and proportional" response.
Trump, who during his election campaign called the nuclear agreement - negotiated under his predecessor Barack Obama - "the worst deal ever", signed the new sanctions into law along with measures against Russia and North Korea.
Iran had already said it would complain to the body that oversees the 2015 deal - under which it accepted curbs on its nuclear program in return for sanctions relief - about the measures passed in Congress last week in response to a missile development program and human rights abuses.
"In our view the nuclear deal has been violated and we will show an appropriate and proportional reaction to this issue," Deputy Foreign Minister Abbas Araqchi said in an interview with state TV, according to the ISNA news agency.
While Russia has reacted to the sanctions by ejecting U.S. embassy staff, Iran has no diplomatic relations or direct trade links with the United States so its options are limited. Araqchi said Tehran's response would be "intelligent".