"The question of suspending uranium enrichment has become part of history and the West is just wasting its time by insisting on this illegal and illogical demand," Rassoul Movahedian told the official IRNA news agency.

Iran last week responded to an offer from world powers to end the nuclear crisis and diplomats are now analysing what they say is a complex answer from Tehran.

The offer from world powers proposes that Iran suspends uranium enrichment, which they fear could be used to make a nuclear weapon, in exchange for techological incentives.