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After months of talks, the two sides agreed to lift sanctions on Iran in exchange for easing the Islamic Republic's isolation on the nuclear issue.
But the nuclear deal's fate remains in question for months, with Tehran blocking progress at the United Nations and international efforts to bring it back into compliance with the terms.
The nuclear deal has the support of many countries, including the United States, Japan, Israel and Saudi Arabia, and the agreement is widely viewed as the foundation of a possible future free-trade and economic trade agreement between Iran and its four permanent members -- the U.S., Britain, France and Germany.
At the World Economic Forum in Davos this month, Iran's top economic and business officials and its state-run media hailed the deal as a "game changer" that could help revive the economy.
The nuclear deal with world powers had a positive impact "on all sides," they said, citing its benefits for the region.
The deal came together after negotiators from Iran, Switzerland and nine other world powers met in Vienna in December and January for 10-day talks, the last day of which ended Tuesday.
They had met several times, and negotiations continue. Iran, which controls its own nuclear program, rejected the possibility that it might withdraw from the agreement in exchange for lifting sanctions.
In Geneva on Thursday, Obama was at the negotiating table to help negotiate the new framework of the deal -- the core agreement -- including the terms. The goal is to reach a final agreement by the end of next year.
The last of the talks began two months ago and concluded on Tuesday.
This is the fifth round of the Iran nuclear talks. They have failed in three previous attempts. They were in the early 1960s.
The U.S. and the five world powers led a team that failed in 2015. The two remaining nations -- the U.K., France, Russia and China -- have all agreed to try again in the summer.
For the world powers, success would allow them to continue negotiations on an economic reform package in exchange for lifting the Iranian sanctions and lifting some of those on Tehran. Iran also could face a deadline to submit its revised, five-year economic reform plan within 14 days.
Negotiators still have issues, including the future o
Manoora leaves for gulf town to find his sister dead, and his wife shot dead by the family's son-in-law. His son-in-law, Mr Riswani, has also killed his father. Riswani and his son-in-law have kidnapped Riswani's family from their home in Ghaziabad and have taken them to Jammu and Kashmir.
The woman, whose identity has not been revealed yet, has been shot dead in the back in Ghaziabad by Riswani's son-in-law, who then heads off to Kashmir in his jeep. He picks up a woman in his jeep and tries to flee but is stopped when the driver calls out to him. The driver gives chase but after leaving for the next village, runs a red light.
Riswani comes back and then drives away again. A while later the driver takes a mobile phone and his son-in-law tries to call the police. Police arrive on the scene and try to make contact with Riswani, who eventually appears alive. His wife, who had managed to escape while being shot at point-blank range by her husband, is badly injured. After hours of fighting, the woman is finally taken to Jammu and Kashmir. Her body is thrown out.
Riswani's brother, who was also killed in the Ghaziabad attack, has described his brother's killing as "shocking". On seeing the pictures of the dead woman, Riswani said he has "a lot of regrets that my brother had to die but I believe his daughter would do well if she came out alive". Police have not offered any comment.
There are fears that the brutal and horrific attack could cause more deaths. However, Riswani's killing has shocked and terrified people in the region, who fear for their lives.
Mum of slain woman Riswani tells of shock as she learns of brother's killers' fate Read more
Riswani's father, an engineer, was part of one of the highest performing army bands, the elite Rapid Action Drum and Bugle Corps. A number of him were killed in a number of attacks in Kashmir, including his home in Srinagar in November 2012 and the village of Dhera in September last year. "I feel great shame at not being able to defend my family as they had no other means of protection and life was being destroyed for me," Riswani told AFP shortly after the attack. "I do feel I have made a mistake in defending myself and my family but I never believed in revenge."
Dipankar Patel, the former director general of the defence ministry, warned last wee