U.S. President Donald Trump on May 8 withdrew from a deal between Iran and major world powers whereby some sanctions against Tehran were lifted in exchange for curbs on its nuclear programme.
Iranian Foreign Minister Mohammad Javad Zarif has met with European Union foreign policy chief Federica Mogherini as the Europeans seek to keep the Iran nuclear agreement.
The US has threatened sanctions against any countries or companies continuing to do business with Iran, which has gone over poorly in European capitals.
At a joint press conference with President of the European Commission Jean-Claude Juncker, Guterres was asked if he was confident that the efforts to save the Iran nuclear deal would be successful and what he thought about the possible intention of United Nations member states to reinstall United Nations sanctions against Iran.
Trump denounced the accord, completed under his predecessor Barack Obama, because it did not cover Iran's ballistic missile program, its role in Middle East conflicts or what happens after the deal begins to expire in 2025.
"We are on the right track. a lot will depend on what we can do in next few weeks", he said.
European diplomats, speaking on background because they did not have authorization to talk otherwise, said on Tuesday that they felt no great urgency, which was just as well, given the difficulty of the task.
Mr Tusk famously said before the 2016 US election that ‘one Donald in international politics is enough
But the reach of the USA financial system, the dominance of the dollar and the presence of European companies' operations in the United States all weaken any potential EU measures.
If the nuclear deal is to stand, Tehran is seeking assurances that European Union trade with Iran will continue its path of growth, with or without the US.
French energy giant Total joined other European companies in signalling on Wednesday they could exit Iran, casting doubt on whether European leaders meeting to try to salvage the Iran nuclear deal can safeguard trade with Tehran.
Bolton in the past has suggested the U.S. government should push for a change in government in Iran.
While Mr. Trump's national security adviser, John R. Bolton, has said that the American intention is to force Iran into new, broader negotiations, European officials said they had heard no American strategy for doing that. Supreme Leader Ayatollah Ali Khamenei, not Rouhani, has the last say on all state matters.
The EU's top energy and climate official, Commissioner Miguel Arias Canete, is heading to Iran on May 18-21 for talks on energy cooperation, a symbolic gesture from the EU that it wants to stay engaged despite the USA withdrawal. "We don't have much to threaten the Americans".