On May 15 (US time), US President Donald Trump said that a 20-year moratorium on Iran's nuclear program is sufficient for him to reach an agreement and end the conflict.
Allowing Iran to enrich uranium at some point in the future, even after decades, marks a change in Mr. Trump's stance. The US President has repeatedly affirmed that Tehran is never allowed to enrich uranium.
When boarding Air Force One to return home after a 2-day summit in China, in a context where there seems to be no clear way out of the Iranian conflict, US President Donald Trump seemed to have adjusted his stance when answering reporters on the plane.
20 years is enough, but the level of guarantee from them is not enough. In other words, it must be a real 20-year period" - Mr. Trump said about Tehran's latest proposal.
Mr. Trump said he had seen the latest proposal from Iran and had rejected it. "If they have any nuclear elements in any form, I will not read the rest" - he said.
The 12-day conflict last year destroyed Iran's ability to enrich new nuclear material in the near future, although the country still has about 440kg of high-enriched uranium. This is the amount of nuclear material that Washington is putting pressure on Tehran to hand over.
Mr. Trump is optimistic that Tehran will eventually agree to an agreement with the US. According to him, the Iranian side told him that only the US and China possess equipment to eliminate what he called "nuclear dust".
Earlier this week, President Donald Trump once commented that Tehran's latest peace proposal was "completely unacceptable" after Iran officially responded to the latest US proposal to end the conflict.
This is one of many peace proposals that the US and Iran have exchanged since Pakistan mediated the ceasefire between the two sides on April 8.