Addressing a press conference with the German Foreign Minister, Iranian Foreign Minister Zarif stated that Tehran and Berlin had "frank and serious" talks about rescuing the 2015 nuclear deal. However, his Emirati counterpart, Sheikh Abdullah bin Zayed Al Nahyan, said any new nuclear deal needed to include concerns like Iran's ballistic missile program and regional influence.
That effort has picked up steam in recent weeks with the re-imposition of penalties aimed at bringing Iran's lucrative oil export revenue to zero following President Donald Trump's decision to withdraw the USA from the landmark 2015 nuclear deal with Iran.
"As I have constantly emphasised, the nuclear-related commitments entered into by Iran under the [deal] represent a significant gain for nuclear verification", he said.
Iran has consistently insisted that it is producing enriched uranium in order to make nuclear energy and that its nuclear program is entirely peaceful.
A USA decision in May to deploy extra military force in the region to counter Iranian threats has raised fears of another conflict breaking out in the region. He will also ask them to uphold and steadily implement the 2015 nuclear deal.
Maas made an official visit to Tehran on Monday to discuss ways to preserve the JCPOA in the wake of US' unilateral withdrawal and imposition of sanctions on Tehran.
"By targeting this network we intend to deny funding to key elements of Iran's petrochemical sector that provide support to the IRGC", Treasury Secretary Steven Mnuchin said in a statement. Maas rejected the idea of "less for less", as in Iran reducing its commitments under the JCPOA in exchange for reduced economic benefits.
Maas conceded that due to the USA exit from the JCPOA, Iran's anticipated economic returns from the deal "never materialized".
International Atomic Energy Agency (IAEA) chief Yukiya Amano stressed that he was anxious about the current heightened tensions with Iran and pushed for a dialogue.
Japan's top government spokesperson also said that in light of the escalating tensions in the region, Japan will seek to use the summit-level talks to try and urge Iran to exercise restraint and engage in dialogue.
Japan had once purchased Iranian oil, but it has stopped over American sanctions.
IAEA chief Yukiya Amano, whose agency is responsible for monitoring Iranian compliance with the nuclear deal, said Iran was now producing more enriched uranium than before, but it was not clear when it might reach the stockpile limit of 300 kg set in the pact.
But, suggesting Tehran did not view Maas as a mediator between Tehran and Washington, he added: "It is unlikely that the German foreign minister is travelling to Tehran to carry a special message".
Regarding the wars in Syria and Yemen, Maas echoed a long-held Iranian position that "the solution is political, not military".
Abbas Mousavi, spokesperson of the Iranian Foreign Ministry, asserted that Tehran will only return to the negotiation table when Washington puts an end to its crusade of "economic terrorism" against Iran. "There are initiatives that are supported by us", he said.