"The issue of enrichment and its limits, extent and capacity, as well as the mechanisms needed for the removal of sanctions are two key issues," Araqchi said in an interview with the state-run TV.
"In addition, there are also several other issues that might not be among the key issues, but are sufficiently important and if they are not resolved, we will not reach any agreement," he added.
Noting that the negotiations are now being held in a more rational atmosphere, Araqchi said, "The result of the negotiations will be something which would meet our redlines and safeguard whatever we have, enrichment will continue and certainly all sanctions will be annulled in the form and sequence (that they have been imposed)."
His remarks came after Iran and the six world powers ended six days of negotiations on Monday and decided to meet again in the next 7 months after missing the November 24 deadline to clinch a final deal to resolve their 12-year standoff over Tehran's nuclear program.