"US hostility has led it to support dictators, butchers & extremists, who've only brought ruin to our region", Iranian Foreign Minister Mohammad Javad Zarif wrote in a Twitter post.
The statement comes a day after Iranian President Hassan Rouhani stressed that US President Donald Trump's wish to keep US forces in Iraq to monitor Iran exposed American "lies" about fighting terrorism.
READ MORE: Iran's President: Trump's Remarks on US Troops in Iraq Reveal American ‘Lies'
In 2018, the United States reinstated sanctions against Iran following Washington's withdrawal in May from the Joint Comprehensive Plan of Action The first round of sanctions came into force in August, followed by a second round that specifically targeted Iran's oil exports in November.