US President Donald Trump has long railed against the 2015 nuclear deal for reasons including its limited duration and the fact it does not cover Iran's ballistic missile program.
In a speech at London's Chatham House on Thursday, Abbas Araghchi said the "atmosphere of uncertainty" under US President Donald Trump has made it more hard for Iran to stay with the deal, also known as the Joint Comprehensive Plan of Action (JCPOA).
Iran has threatened to abandon the nuclear deal it signed with worldwide powers unless the United States stops its "daily violations" of the agreement by seeking to prevent the world doing business with it.
In December 2016, Iranian President Hassan Rouhani ordered the country's scientists to start work on nuclear-powered ships in response to the renewal of sanctions by the United States.
Although the USA and the European Union have lifted sanction against Iran, allowing businesses and banks to do business there, the Islamic Republic reports they have not seen the economic benefits they expected after agreeing to curb their nuclear program. Now it seems Iranian officials believe the deal was also a failure for them.
Last month, Trump extended waivers of key economic sanctions on Iran, lifted under the JCPOA, for another 120 days but said he was doing so "for the last time".
Iran has inched above that ceiling twice since the enactment of the accord, known as the Joint Comprehensive Plan of Action (JCPOA). But Iran has been playing the game since the nuclear deal was agreed to in July 2015.
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"If we lose the JCPOA, we will face another nuclear crisis", Araqchi said.
Zarif's threat that Iran would treat a non-nuclear issue as a breach of the nuclear deal intimidated the Obama administration into undermining a law that the president himself had signed.
For two years, the United States, Iran, and other global partners were on the same page regarding Iran's nuclear program, Marashi explained, meaning that "the prospects for conflict were reduced".
"The Iranians might do things that have nothing to do with nuclear weapons but advance the technical aspects of their nuclear programs over a long period of time", said Marashi.
"First, it must demand that Iran allow immediate inspections at all sites requested by global inspectors".
Lowly enriched uranium can be used for peaceful applications such as power generation, Iran's stated aim, but also for a nuclear weapon if processed to a higher level.