For his part, German Foreign Minister Heiko Maas insisted his country and other European nations want to find a way to salvage the nuclear deal, which saw Iran limit its enrichment of uranium in exchange for the lifting of economic sanctions.
He also warned: "Whoever starts a war with us will not be the one who finishes it".
Iran's foreign minister has said the United States "cannot expect to stay safe" after launching what he describes as an "economic war" against Tehran.
The nuclear deal, which sees Iran limiting its nuclear activity in exchange to economic benefits, was struck in 2015 by the US, China, Russia, Britain, Germany, France and the European Union, but started to crumble in May past year when US President Donald Trump pulled out of it.
On May 8, 2018, US President Donald Trump pulled his country out of the nuclear accord.
Quoting Mousavi's statement, Iranian state television reported yesterday that "the Europeans have so far failed to meet their obligations under the agreement and still protect Iran's interests after the US' illegal withdrawal".
Donald Trump explains why he called Meghan Markle nasty
Trump is on a pomp-laden state visit to Britain and has been feted by the royal family and Britain's political elite. Prince Harry set off British tabloid speculation that he avoided spending additional time with Trump.
The three European Union members have been trying to get Iran to keep its commitments under the deal to cut back its nuclear program - which Washington distrusts - by helping it to circumvent the trade sanctions Washington has reimposed.
"The EU is not in a position to question Iran's issues beyond the nuclear deal", he added.
Tehran has responded by threatening to abandon some of the restrictions on its nuclear activities imposed by its landmark 2015 deal with major powers, which also lifted global sanctions against the country.
There are wars in Syria and Yemen, and it's not a war here, and we do our best to avoid a war. America's John Huddy reports on the increasing tensions.
Zarif also took aim at the US and its allies' actions in the Middle East. Diplomats say the system is unlikely to have much impact on commercial trade with Iran but could be used for humanitarian transactions that are permitted under United States sanctions.
"Tensions here in the region are worrying, and we fear that isolated events could trigger developments that end in violence, and we want to prevent this at all costs".
Zarif said in his speech on June 9, "The discussion is not about an ultimatum".
Enriched uranium is used to make reactor fuel but also nuclear weapons, while spent fuel from a heavy-water reactor contains plutonium that would be suitable for a bomb. "A financial mechanism called INSTEX has been devised in this respect".