Iran's foreign minister says there "seems to be no agreement" on two key issues just hours before the latest round of Syria talks Friday morning in New York.

Mohammad Javad Zarif told The Associated Press that his country has seen no list it can agree on of Syrian opposition groups that should be included in peace negotiations, or of Syrian groups that should be considered terrorist organizations instead.

Zarif says "we still don't know" if there will be any concrete progress in the talks that are aimed at bringing an end to Syria's conflict.

Russia and the United States are leading the talks, but Russia's ambassador to the U.N. tells reporters that he sees attempts to "undercut" the communiques that have been agreed upon in the Syria discussions so far.