Iran has been on the back foot since the US and the other powers, in January 2018, decided to abandon the agreement.
The United States and the others have argued that Iran’s behaviour has not changed since then.
But there is evidence that the Iranians have been making some major concessions to try to make their negotiators’ dreams of a deal more palatable.
What are the options?
The United Nations sanctions regime is unlikely to be lifted any time soon and the new US administration is likely to make a number of concessions in its negotiations with Iran.
These include extending the sanctions to the oil-rich country, which is a key Iranian demand.
But other concessions could also include lifting some of the crippling economic sanctions imposed by the US.
In return, Iran could be forced to give up some of its nuclear activities.
Read more:What’s next?
The United States has also said that it is prepared to lift the US sanctions against Iran in exchange for Tehran taking more concessions in the nuclear negotiations.
But the White House has also warned that any such deal will not go ahead without the support of the United Nations Security Council.
What does Iran want?
The two countries have a history of working together.
In 2015, Iran signed a landmark agreement with world powers, including the US, to reduce the country’s nuclear stockpile and agreed to stop enriching uranium to a level of up to 20% purity.
But Iran has never actually achieved the higher purity it is aiming for.
Iran also wants to cut back its oil exports to the US in return for lifting sanctions.
The United Nations estimates that Iran has spent $100bn (£70bn) on sanctions relief since the deal was struck in the spring of 2018.
The US and its allies have argued in favour of the deal, but Iran has strongly objected, saying it would not accept the lifting of sanctions, which are considered a major obstacle to Iran’s nuclear programme.
How will it affect the US economy?
Iran has been forced to slash its budget to keep up with rising inflation.
President Donald Trump has said that his administration is in favour.
According to the United States Department of Treasury, Iran has reduced its government spending by $1.5bn in the first six months of 2019.
That has helped to offset inflation, which has risen by over 20% in the last 12 months.
The Iranian government has also increased food and other spending by over 10%.
However, the economic impact of the sanctions will be felt in Iran, as millions of Iranians will have to wait longer for their weekly ration of food.
Will I be able to buy more food if I go back to Iran?
The US has said the deal will allow Iranian citizens living in the US to return to their country.
However, many Iranians will still have to travel abroad to buy their weekly food rations, and it is likely that those who have already been living in Iran for decades will have difficulty finding work.
How will the Iranian economy impact on the US?
Inflation is expected to rise by around 20% over the next few years.
Inflation will be worse for Iranian expats, many of whom will be able no longer travel abroad and find jobs.
Is it possible that Iran will become a major oil exporter?
It is possible.
Under the terms of the nuclear deal, Iran agreed to cut its oil imports by 25% and increase its production by 20% by 2025.
However, Iran will still be able export oil to the rest of the world, and the US is willing to allow Iranian companies to export oil on US ships and on Iranian soil.
This could create a big economic boost for Iran, but the US will have a huge incentive to restrict the sale of Iranian oil in order to keep the nuclear agreement alive.