The International Court of Justice rules that Washington violated the 1955 friendship treaty with Tehran, which was still in place when US courts froze the assets of Iranian companies.
Both were convicted of espionage in October 2016 and sentenced to 10 years in prison.
Several Iranian officials have said that a deal on Iran's nuclear programme is expected before the end of the week with some minor technical issues being discussed in Vienna.
Iran’s bargaining will be much tougher but a compromise also seems likely provided the US would seriously consider removing sanctions.
US President Biden says Washington will not lift sanctions on Tehran until it shows compliance to 2015 nuclear deal. Tehran wants Washington to lift sanctions first before it returns to strict compliance with the pact.
The warning comes as Iran’s clerical and military rulers blame Israel for the killing of its foremost nuclear scientist Mohsen Fakhrizadeh.
The UN envoys for Britain, France and Germany said that they remain committed to retain the nuclear agreement with Iran.
Turkey's President Erdogan says that he is open to mediating talks between Washington and Tehran to deescalate tensions and find a common ground to solve the problems.
A six-month US waiver on Iran's sanctions, which allowed Turkey and other nations to continue buying oil from Iran, expires on May 2.
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