WASHINGTON, Feb. 27 (Xinhua) -- The U.S. State Department on Wednesday welcomed that Iran was interested in the proposal presented by the world powers at the nuclear talks in Kazakhstan.
"The process will continue, we have to see how it's gong to play out over the coming weeks, but we welcome that, you know, Iran was interested in our ideas," said State Department spokesman Patrick Ventrell at a regular briefing.
However, he did not give details of the proposal, only characterizing it as "updated" and "serious."
Describing the talks as "useful," Ventrell stressed that now the "onus is absolutely on Iran."
"We'd like to see them to take some of the concrete steps they need to come in line with the international communities concerns or come in line with their obligation quite frankly," he told reporters.
The two-day talks between Iran and the P5+1 powers -- Britain, China, France, Russia, the United States plus Germany, over Tehran 's disputed nuclear program concluded on Wednesday in Almaty, Kazakhstan. World powers attending the talks said on Wednesday that the meeting had produced positive results.
Iranian chief nuclear negotiator Saeed Jalili expressed optimism Wednesday about the outcome of the nuclear talks, saying that the world powers' attitude toward Iran's nuclear issue was " more realistic."
Iran and the world powers agreed to hold an expert-level meeting in Istanbul, Turkey on March 17 and 18, and another high- ranking meeting in Almaty, Kazakhstan on April 5 and 6.