China's envoy to the Vienna talks on Saturday said lifting sanctions was key to concluding an agreement on Iran's nuclear program.
He told Al-Sharq news website that all parties in the negotiations were committed to finding solutions, but some unresolved political issues remain.
Russian envoy Mikhail Ulyanov also said in a tweet that "All participants reiterated their determination to bring the negotiations to a successful conclusion."
Today's talks are the sixth round of the so-called Vienna talks on reviving Iran nuclear deal or the JCPOA.
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