The next round of talks between Iran and six world powers will take place either in China or Kazakhstan, Fars News Agency reported citing sources in Moscow.

FNA says diplomats were exchanging views over a proper venue for their next round of negotiations.

Iran and six world powers blamed each other for deadlock at talks on Tehran's nuclear program on Tuesday, June 19.

The six powers want Tehran to stop enriching uranium to levels that bring it close to acquiring weapons-grade material, but Iran has demanded relief from economic sanctions and an acknowledgement that it has the right to enrich uranium.

If talks collapse, anxiety could grow on financial markets over the danger of higher oil prices and conflict in the Middle East because Israel has threatened to attack Iranian nuclear sites if diplomacy fails to stop Tehran getting the bomb.

"We did not come to Moscow only for discussions. We came to Moscow for a resolution. But we believe the opposite side is not ready to reach a resolution," an Iranian diplomat said.

Iran says its program has only non-military purposes but the so-called P5+1, grouping the five permanent members of the UN Security Council plus Germany - say Tehran must do more to prove this and permit United Nations inspections of its work.