The P5+1 group of negotiators and Iran have extended their original end-of-June deadline to reach a comprehensive deal twice but EU foreign policy chief Federica Mogherini said Tuesday they would continue working until an agreement was reached.
"We're working hard, but not rushed, to get the job done. Mark my words; you can't change horses in the middle of a stream," Zarif wrote on Twitter.
We're working hard, but not rushed, to get the job done. Mark my words; you can't change horses in the middle of a stream. #IranTalksVienna
— Javad Zarif (@JZarif) July 9, 2015
Later, answering a question on how long Tehran's negotiators are ready to stay in Vienna, Iranian Foreign Minister Javad Zarif said "as long as necessary."
The long-anticipated agreement envisions sanctions relief for the Islamic republic in exchange for the curtailment of its nuclear program for a decade or longer.
The remaining issue is said to be Iran’s demand for the UN Security Council to lift its conventional weapons program ban, with the timing of sanctions relief largely settled.