The UN Security Council on Friday postponed a scheduled vote on a resolution imposing sanctions against Iran's nuclear program.
A UN diplomat said on condition of anonymity that the five nations - the United States, China, Britain, France and Germany - which had worked with Russia on the resolution were waiting for the final decision of Moscow.
Russia's UN Ambassador Vitaly Churkin said Thursday that there were still "two or three" difficult issues unsolved and called for "further thinking and maybe further discussion of the draft resolution."
The six countries will hold talks as soon as they get the latest amendment from Russia, and may go to vote as early as Saturday, the diplomat said.
The draft, originally set to vote on Friday, is sponsored by Britain, France and Germany. It would ban the import and export of materials and technology relating to uranium enrichment, reprocessing and heavy-water reactors, as well as ballistic missile delivery systems.