PARIS, Jan 7 (Reuters) - Progress has been made regarding the Iran nuclear talks although time is running out, France"s foreign minister said on Friday. Indirect talks between Iran and the United States on salvaging the 2015 Iran nuclear deal resumed on Monday. Western diplomats have indicated they are hoping to have a breakthrough by the end of January or early February, but sharp differences remain with the toughest issues still unresolved. Iran has rejected any deadline imposed by Western powers. "I remain convinced we can reach a deal. Bits of progress have been made in the last few days," Jean-Yves Le Drian told BFM TV and RMC Radio. "We have been heading in a positive direction in the last few days, but time is of the essence, because if we don"t get an accord quickly there will be nothing to negotiate." The eighth round of talks, the first under Iran"s new hardline President Ebrahim Raisi, resumed on Monday after adding some new Iranian demands to a working text. Another positive sign this week was the arrival in Vienna of South Korea"s Vice Foreign Minister to discuss with Iran, the United States and other parties the possible release of $7 billion of frozen Iranian assets held in the Asian country because of U.S. sanctions. Any release would need to be approved by Washington. The ministry said in a statement that the vice minister had agreed with the Iranians that the release of the frozen assets "should take place in an urgent manner." "It will be discussed at the sanctions removal working groups in Vienna," an Iranian official said, clarifying that the funds would not be released immediately. Western powers have said progress was too slow and negotiators had "weeks not months" left before the 2015 deal becomes meaningless. Iran refuses to meet directly with U.S. officials, meaning that other parties - Britain, China, France, Germany and Russia, must shuttle between the two sides. In an interview with Al Jazeera on Thursday, Iran"s Foreign Minister Hossein Amir-Abdollahian also suggested the situation was positive, but repeated Tehran"s position that all sanctions must be lifted and that Washington should provide guarantees that it will not pull out again. Little remains of that deal, which lifted sanctions against Tehran in exchange for restrictions on its atomic activities. Then President Donald Trump pulled Washington out of it in 2018, re-imposing U.S. sanctions, and Iran later breached many of the deal"s nuclear restrictions and kept pushing well beyond them.