Zarif recently concluded a trip to India and Thailand, where he is reported to have made much progress in convincing these nations to help Tehran "bypass" the new USA sanctions, which were fully reimposed by the Trump administration after its decision to walk away from the nuclear agreement.
But Indian foreign minister Sushma Swaraj said New Delhi´s position was independent of any other country.
Russian Federation and France, both signatories to the nuclear deal, have vowed to keep upholding it and have been working with Tehran to find ways to help their businesses avoid US sanctions.
Under Trump's predecessor, Barack Obama, India was forced between 2012 and 2015 to significantly slash Iranian oil imports and pay Iran in rupees or initiate barter trade.
Ms. Swaraj's comments came just ahead of a meeting with Iranian Foreign Minister Javad Zarif, who has been travelling to several capitals including Moscow, Beijing and Brussels, in an effort to salvage the agreement despite the US move. Trade is one reason, given the robust market India provides for Iranian oil.
"We only recognise United Nations sanctions".
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In the letter, Iran's Zangeneh "underlined imposition of unlawful, unilateral and extraterritorial sanctions by the U.S. government on the Islamic Republic of Iran which clearly violate the global agreement that had been endorsed by the UN Security Council", the Iranian oil ministry's news service Shana reported.
The sanctions target Director-General of Islamic Republic of Iran Broadcasting Abdulali Ali-Asgari, Ansar-e Hezbollah leaders Hossein Allahkarah, Abdolhamid Mohtasham and Hamid Ostad, Secretary of Iran's Supreme Cyberspace Council Abolhassan Firouzabadi and Iranian judiciary official Abdolsamad Khoramabadi, the US Treasury Department's statement said.
Zarif said Iran and India have good cooperation and hoped that bilateral cooperation in different fields, especially in energy, would further expand. Discussing the relations with Pakistan, Swaraj said, "We are always ready for talks with Pakistan but with a caveat that terror and talks can not go together".
And while Predator Drones may be crucial if and when deployed for anti-terror operations targeted at Pakistan, it is reported that the need for S-400 missile shield is no less important and can be crucial in strengthening India's air defence abilities - especially along the Sino-Indian border. "Let us decide about one point, you give up terror and we can have talks", said Ms Swaraj.
"Thanks to India status as Iran's political and economic partner in the region, we have organised the meeting with Indian officials in different governmental sectors", Zarif said.