"The next round of talks on the [Iranian] nuclear program will be held around March 15-20," the source told RIA Novosti.
The source added that Tehran does not see March 24 as a deadline to reach an agreement on the country's nuclear program. The negotiators earlier agreed to work out a political deal by that date.
"This deadline is not for us, [it is a] deadline for the Americans and the other sides. Nobody should exert pressure on us only because we are approaching a deadline, we have time until the end of June," he said.
Since November, 2013 Iran and the P5+1 group of international mediators comprising Russia, the United States, China, the United Kingdom, France and Germany have been negotiating a long-term deal. The agreement is expected to ensure the peaceful nature of Iran's nuclear activities in exchange for the lifting of sanctions on Iran.
The deadline for reaching a final agreement was set for this July.