It has been a year since Iran and six world powers reached a landmark deal on Tehran's nuclear program. Iran's President Hassan Rouhani has praised the 'new atmosphere' created by the accord, saying it can lead to 'better economic, defense, and technological activity' for the country.

"The sanctions related to the nuclear issue were lifted. Of course, in some fields including banking, we still haven't reached yet the expected level. If one day the P5+1 decides to give up its commitment, we will still remain faithful to our promises," Rouhani said.

The agreement limited Iran's nuclear program in exchange for the lifting of economic sanctions on it. It took effect in January. There has been some disappointment in Iran that the lifting of the sanctions has not yet led to significant investments, with many international investors and banks still wary of doing business there. But Rouhani has also said Iran is "completely ready" and is able to restore its nuclear program quickly if other parties violate the deal.
 
"At any time and under any circumstances, should they refuse to keep to their commitments, we are completely ready and have the nuclear capability to roll back our nuclear program to a desirable stage in a short period of time," Rouhani said.