The US new sanctions against top Iranian officials signify Washington's "disrespect" for international law, Tehran's Ambassador to the UN was quoted as saying by Iran's state TV on Tuesday.
"The US decision to impose more sanctions against Iran is another indication that American does not attach any respect to the international laws and the prevailing international opinion," Majid Takht Ravanchi said in New York.
On Monday, US President Donald Trump signed an executive order for sanctions targeting Iran's Supreme Leader Ayatollah Ali Khamenei, his office and those closely affiliated with him, Xinhua news agency reported.
Washington also announced that Iran's Foreign Minister is in the US' upcoming list of sanctions.
In the meantime, Trump said that he is open for dialogue with Iran without preconditions.
Ravanchi, however, dismissed the US' calls for dialogue, saying that "no one in clear mind can have a dialogue with somebody who is threatening you with sanctions".
The US must stop "its economic warfare and terrorism against the Iranian people", he added.
The new sanctions by the US on Monday come in the wake of downing of an American drone by Iran last week.
Iran said the drone had violated its airspace, which the US has denied.
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