Updated

Russia's foreign minister says Iran is willing to halt its 20-percent enrichment of uranium, which has been a key concession sought in international negotiations over Iran's nuclear program.

That is the highest level of enrichment acknowledged by Iran and one that experts say could be turned into warhead grade in a matter of months.

In an interview with the Kuwaiti news agency KUNA that was released by the Foreign Ministry on Tuesday, Sergey Lavrov said that "for the first time in many years" there are encouraging signs in international efforts to resolve the Iranian nuclear dispute.

He said Iran has confirmed that it is ready to halt production of uranium enriched to 20 percent. He did not give details, but said the sextet of international negotiators should make "substantial reciprocal steps."