In the present complicated world, Iran and US have no choice but to make an agreement.
The analyst praised President Hassan Rouhani's "War Against Violence and Extremism (WAVE)" proposal, noting that it can improve peace and stability in the world.
President Rouhani's administration proved that it is willing to make an agreement with G5+1, he added.
Grassie noted that all sides of talks should use the opportunity for reaching the agreement.
There are lots of common grounds for cooperation between Tehran and Washington and the two sides should continue talks in this regard, he advised.
Source: IRNA