An influential Iranian lawmaker said Sunday that western countries, in particular the U.S., were responsible for the failure of the Istanbul talks, the semi-official ISNA news agency reported.

The Islamic Republic entered the talks with clear offers and transparent, logical and practical stance, but the West unfortunately failed to seize the opportunity, Kazem Jalali was quoted as saying.

Istanbul talks seemed to bring fruitful results, but some western countries and in particular the U.S. officials chose to make troubles in Istanbul talks as they used to do in the past, said Jalali according to the report.

"They (Westerners) should end threat, sanction, pressure ... so that joint concerns could be dealt with based on collective respect," Iranian lawmaker added.

"We have not left table of talks so far and we are ready for negotiations," but the talks should be meaningful and based on recognition of Iranian nation's nuclear rights, he said, according to ISNA.

The remarks of the EU Foreign Policy Chief Catherine Ashton concerning Iran's preconditions in the nuclear talks resulted from a "diplomatic mistake", said the Iranian lawmaker.

Ashton told a news conference at the end of the two-day talks in Istanbul on Saturday that Britain, China, France, Russia, the United States and Germany (G5+1) were "disappointed" with Iran's stance in the nuclear talks and its preconditions were unacceptable.

Ashton said no further meetings were planned but the door remained open for Iran if it chose to respond positively.

"Ashton's remarks resulted from a diplomatic mistake, since Iran has always declared its readiness; and today ball is in the western countries' court," Jalali was quoted as saying by ISNA.

Six world powers wrapped up crucial nuclear talks with Iran in Istanbul on Saturday but failed to reach any agreement on Iranian nuclear program.