Additional sanctions imposed on Iran by the United States show that Washington's offer of talks is not genuine, Iranian Foreign Ministry spokesman Abbas Mousavi said on Saturday.
The United States sanctioned Iran's largest petrochemical holding group on Friday for indirectly supporting the Islamic Revolutionary Guard Corps (IRGC), a step it said aimed to dry up revenues to the elite Iranian military force but that analysts called largely symbolic.
U.S. President Donald Trump said earlier this month that he would be willing to talk to the Islamic Republic.
"It was only necessary to wait one week until the claim of the president of America about talks with Iran were proven to be hollow," Mousavi said in a statement. "The American policy of maximum pressure is a defeated policy."
Tensions have risen between Iran and the United States in recent weeks after Washington sent more military forces to the Middle East, including an aircraft carrier, B-52 bombers and Patriot missiles, in a show of force against what U.S. officials call Iranian threats to U.S. troops and interests in the region.
The United States aims to intensify economic and military pressure on Iran because of its nuclear and ballistic missile programmes as well as its support for proxy groups in Syria, Iraq, Lebanon and Yemen.
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U.S. President Donald Trump antagonized Iran, and dismayed key U.S. allies, last year when he exited a 2015 deal between Tehran and world powers under which Tehran curbed its nuclear program in return for an easing of most international sanctions.
Trump denounced the deal, signed before he took office, as flawed and reimposed tough financial sanctions on Iran that were subsequently extended to its lifeblood oil exports.
Trump said on Thursday that Iran was failing as a nation, under the pressure of his sanctions, and repeated his call for talks with the leadership in Tehran. Mousavi on Friday dismissed Trump's comments as "repetitive, groundless and paradoxical" and said they did not merit a response.