Iran is threatening to retaliate after the U.S. Senate gave Congress’ final approval to an extension of the American sanctions against Iran that lawmakers of both parties said is crucial to enforcing the international nuclear accord with Tehran.

“Iran has proved that it sticks to its international agreements, but it also has appropriate responses for all situations,” said Iran Foreign Ministry spokesman Bahram Ghasemi. “The extension of sanctions by the U.S. Congress is a violation of the deal.”

Ghasemi was not specific about what action would be taken.