Parisa Hafezi, Francois Murphy, John Irish VIENNA (Reuters) - Talks to save the 2015 nuclear deal on Friday are unlikely to satisfy Iran, European powers said, and Tehran warned that it could leave the accord if it was not fully compensated for the re-imposition of U.S. sanctions. Ministers from Britain, China, France, Germany and Russia meet their Iranian counterpart in Vienna for the first time since U.S. PresidentDonald Trump left the pact in May, but diplomats see limited scope for salvaging it. Trump pulled the United States out of the multinational deal under which sanctions on Iran were lifted in return for curbs on its nuclear program verified by the International Atomic Energy Agency (IAEA). Washington has since told countries they must stop buying the OPEC producer’s oil from Nov. 4 or face financial consequences. Speaking on French radio ahead of arriving in the Austrian capital, France’s foreign minister said world powers would struggle to put together an economic package immediately. “They (Iran) must stop threatening to break their commitments to the nuclear deal,” Jean-Yves Le Drian said. “We are trying to do it (economic package) before sanctions are imposed at the start of August and then the next set of sanctions in November. For August it seems a bit short, but we are trying to do it by November,” he said.