Drafting a final nuclear agreement between Iran and world powers would be "difficult and slow," Iran' s Foreign Minister Mohammad-Javad Zarif said on Tuesday. "This round of talks would probably be the last round of reviewing important subjects that the sides believe should be addressed in the final agreement, and from the next round, we will start to jointly draft a final agreement which would be a complicated, difficult and slow-moving job," Zarif wrote on his facebook account ahead of Tuesday nuclear meeting between Iran and the six world major powers in Vienna. For this reason, he has formed a consultant group of local and international lawyers to help Iran's nuclear negotiators, Zarif said, adding that his countrymen and friends are also invited to email him their proposals and legal points over the final draft. Zarif said, during the meeting with the EU foreign policy chief Catherine Ashton on Monday night, he has reiterated the "mutual respect" in the nuclear talks between Iran and the so-called P5+1 group, namely Britain, China, France, Russia, United States plus Germany. Zarif described his meeting with Ashton as "useful," saying that "We discussed the ways of continuing the negotiations and the remaining issues in this phase" of the talks, according to Press TV. On Monday, he said the tangible solution for resolving Iran's nuclear issue could be found in six months, provided all sides involved in the talk have the political will. Iran and the six major states are heading to a comprehensive agreement for a long-term solution for the Iran nuclear issue. The western states want Iran to significantly scale back its nuclear program to address the world concern while providing sanction relief in return.