After the United States departure from the nuclear deal, Iran is making sure that the deal survives under all circumstances.
However, Ryabkov added that Moscow did not believe the accord could be amended to include limits on Iran's actions in the Middle East or its ballistic missile program, as has been demanded by US President Donald Trump.
Russian Federation stated that it will adhere to and protect the Joint Comprehensive Plan of Action (JCPOA), also known as the Iran nuclear deal, the reportsaid.
The announcement by Donald Trump that the U.S. would pull out of the agreement came with the restoration of sanctions against Tehran, including six individuals and three companies it claims are funnelling millions of dollars to the Islamic Revolutionary Guard's elite Quds Force.
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.
That is part of a flurry of diplomatic activity following Trump's unilateral withdrawal from what he called "a frightful, one-sided deal", a move accompanied by the threat of penalties against any foreign firms doing business in Iran.
"The final aim of these negotiations is to seek assurances that the interests of the Iranian nation will be defended", Zarif said at the start of a meeting with Lavrov.
President Hassan Rouhani said he had asked foreign minister Mohammad Javad Zarif to negotiate with European countries, China and Russian Federation in the coming weeks.
Putin will also meet Yukiya Amano, the head of the International Atomic Energy Agency in Sochi, presidential aide Yury Ushakov said.
He also said Iran should receive economic benefits promised in the accord, even if the USA reinstates sanctions.
After long negotiations, Iran had agreed in July 2015 to freeze its nuclear programme in return for the lifting of punishing global sanctions.
"Since the signing of the JCPOA (nuclear deal), we have gone from an atmosphere like a gold rush, to one of utter depression", said a Western trade diplomat on condition of anonymity.
His hourlong meeting with Mogherini was in preparation of a wider discussion later on May 15 with the foreign ministers of three other European Union partners in the landmark deal: Germany, France, and Britain.
"The secretary underlined that the United States and our European allies share strong interests in preventing Iran from ever developing a nuclear weapon and in countering the Iranian regime's destabilizing activities in the region", spokeswoman Heather Nauert said in a statement.