He added that Russian Federation will fulfill its obligations under the Joint Comprehensive Plan of Action for Iran's nuclear program to the same extent as other participants.
Iran's foreign minister is visiting China for talks following President Donald Trump's decision to scrap US participation in the agreement over Iran's nuclear program.
Iran said it would remain committed to the deal without Washington if Tehran achieved its goals - namely being protected from sanctions against key sectors of its economy such as oil - in cooperation with other countries that have signed up to the agreement.
Iran's foreign minister has held talks in China as he began a diplomatic tour with the remaining signatories of a multinational nuclear deal following the recent U.S. withdrawal from the landmark 2015 pact.
Zarif will then travel to Brussels for talks with the European countries that are party to the JCPOA on the possibility of preserving the accord with Iran's interests at its heart.
Zarif's meetings in Brussels cap a whirlwind global tour, including trips to both Russian Federation and China, the two other signatory nations, in a bid to bolster support.
Roth said Europe was willing "to assume greater economic responsibility in Iran" if Tehran continued to follow the agreement that is meant to prevent the construction of nuclear weapons by Tehran through global controls.
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Highlighting just how hard it will be, the U.S. Treasury announced on Tuesday more sanctions, including on Iran's central bank governor, just minutes before the Brussels meeting was due to begin.
Germany's Merkel is set to visit Russian Federation and meet Putin for a working visit in the Black Sea resort of Sochi on Friday, while French President Emmanuel Macron will be in Saint Petersburg later in the month for an economic forum.
In a meeting in Beijing over the weekend, Chinese Foreign Minister Wang Yi promised Zarif that Beijing would take "continue to work to maintain the deal".
He also described his meeting with Mogherini as constructive, adding that they had underlined the need for the full implementation of the JCPOA by all the remaining signatories and for providing guarantees to Iran that safeguard its benefits from the deal.
It reiterated that Iran was preparing to resume "industrial scale" uranium enrichment "without any restrictions" unless Europe provided solid guarantees it could maintain trade ties despite renewed United States sanctions.
In the aftermath of Washington's pullout, Europeans are seeking ways to protect the interests of their firms doing business in Iran and help them escape the brunt of the upcoming USA sanctions.
Under the deal, Iran undertakes to curb its nuclear activities and place them under total control of the International Atomic Energy Agency (IAEA) in exchange of abandonment of the sanctions imposed previously by the United Nations Security Council, the European Union and the United States over its nuclear program.