The UN envoys for Britain, France and Germany said that they remain committed to retain the nuclear agreement with Iran.
US Justice Department accused Iran of "forcibly" boarding an unrelated ship after the four tankers were seized "in an apparent attempt to recover the seized petroleum."
Three members of the bloc led by Saudi Arabia continue to enforce an economic and political blockade of Doha.
Iran's supreme leader has responded by ruling out negotiations with the US over Tehran's ballistic missile and nuclear programmes and urging Iranians to resist pressure.
The reported deal between the two countries has been overstated, and its motives misunderstood.
The Mahan Air plane was heading from Tehran to Beirut over Syrian airspace when US fighter jet passed by for what Washington called a routine inspection. The airliner landed safely in Beirut.
A vote on the war powers resolution could take place as early as Thursday, amid concerns that Trump could embark on open military conflict with Tehran without consulting Congress.
The Syrian pound has hit a new low against the US dollar as its main backer Iran navigates renewed social unrest and regional tensions.
Shackled with sanctions, Iran’s shadow economy relies on access to markets in Dubai to keep things running at home.
US Secretary of State Mike Pompeo and Treasury Secretary Steven Mnuchin announce fresh sanctions against eight top Iranian officials, as well as against more than a dozen leading producers of metals in Iran.
The two sides meet in what is being seen as a sign of attempts to ease tensions in the Persian Gulf.
Many Turkish businessmen are facing huge losses as their products are systematically banned in Iraq, while sanctions-hit Iran pursues its own business interests in the country.
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