An official at Iran's presidential office says nuclear talks are the last option to start interaction with the United States.
Iran and the US have agreed on the fact that they see the efforts to resolve the nuclear issue as a "test of wills" to address other issues and the United States should be realistic to help settle the nuclear dispute, Hamid Aboutalebi wrote in an article published on his website on Saturday.
Now it is more possible for Iran and the US to hold dialogue, he said.
The US has chosen a diplomatic dialogue with Iran over war and sanctions, he said.
He went on to say that in their relations with the US, the Iranian people have experienced resistance and confrontation and now they have chosen political dialogue.
Now Iran and the US are standing on the verge of diplomacy, Aboutalebi added.
He also said the US should adopt realistic approaches, stop making claims and try to build trust by removing sanctions to pave the way for the resolution of the nuclear issue.
If diplomacy fails at this stage, hostility will not be replaced by dialogue, he warned.
Elsewhere, Aboutalebi stated that if the two countries cannot reach a nuclear agreement through talks and dialogue, they will not be able to reach agreement on other challenging issues.
Last week, in an interview with The New York Times, US President Barack Obama defended a framework nuclear agreement with Iran as an "once-in-a-lifetime opportunity."
