Iranian Foreign Ministry spokesman Abbas Mousavi has said additional sanctions imposed on Iran by the United States show that Washington's offer of talks is not genuine.
The United States placed sanctions on 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.
US President Donald Trump said earlier this month 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 US officials call Iranian threats to US troops and interests in the region.
Iranian Defence Minister Amir Hatami noted the presence of American warships in the region on Saturday and said that the Islamic Republic's enemies are afraid of conflict because of the country's advanced offensive and defensive power, according to the Iranian Students' News Agency (ISNA).
"They are afraid of any kind of war or possible conflict with Iran," he said, noting that US offers of talks without preconditions are false.
The US is aiming 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.
US President Donald Trump antagonised Iran, and dismayed key US 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.
