Speaking on August 27 at the start of four days of hearings, a lawyer representing Iran, Mohsen Mohebi, told the court in The Hague that the USA sanctions violate terms of the 1955 treaty signed by the United States and Iran.
Iran went to the United Nations' highest court Monday in a bid to have US sanctions lifted following President Donald Trump's decision earlier this year to re-impose them, calling the move "naked economic aggression".
Iran filed a complaint against Washington in July, saying that by pulling out of the deal, the USA breached the Treaty of Amity, Economic Relations, and Consular Rights signed in 1955.
Iran is going to the United Nations' highest court in a bid to.
Trump says the sanctions are needed to ensure Iran never builds a nuclear bomb.
The ICJ is the United Nations tribunal for resolving worldwide disputes. He called Trump's sanctions policy "nothing but a naked economic aggression against my country".
The sanctions have hit Iran hard, with the country's currency losing much of its value, leading to protests on the streets of many Iranian cities.
The Joint Comprehensive Plan of Action (JCPOA) is the name given to the 2015 worldwide agreement under which sanctions on Iran were lifted in return for curbs on its nuclear program.
Both airlines re-opened the Tehran route in the wake of the global accord between western powers and Iran, under which crippling economic sanctions on Tehran were lifted after its leaders agreed to roll back the scope of the country's nuclear activities.
Iran's economy has slumped since US President Donald Trump ordered that the sanctions be reinstated in May.
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In November, a second batch of potentially more damaging sanctions will be reimposed on Iran's oil and shipping sectors as well as its central bank. A final decision in the case may take years.
A raft of worldwide companies - including France's Total, Peugeot and Renault, and Germany's Siemens and Daimler - have suspended operations in Iran in the wake of the move.
The ICJ president Abdulqawi Yusuf heads a 15-judge panel hearing Iran's case.
At the time, British Airways Head of Network and Fleet Sean Doyle touted the new flights as a result of the aforementioned agreement and resulting lifting of sanctions.
Air France and Dutch sibling KLM will halt flights by the end of September due to "weak commercial results", the group said Thursday.
The US has vowed to "vigorously defend" itself against Iran's "baseless" lawsuit.
The U.S. previously said it does not acknowledge the court's jurisdiction regarding the case. Experts expect the U.S. to challenge the ICJ's jurisdiction.
The ICJ has so far ruled the 1955 treaty is still valid, even though it was signed long before the 1979 Islamic Revolution that triggered decades of hostile relations with Washington.
The ICJ is the principal judicial organ of the United Nations and settles legal disputes between member states. Its rulings are binding, but it has no power to enforce them and on rare occasions they have been ignored by some countries, including the United States.