World powers will warn Iran to stick to the terms of their nuclear deal when they meet on Friday for “last chance” talks, but with Tehran feeling the pressure from punishing U.S. sanctions expectations of saving the 2015 accord are low, diplomats say.  President Donald Trump last year 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 re-imposed tough sanctions on Iran, aiming to cut the Islamic Republic’s oil sales to zero to force it to negotiate a broader deal that would also cover its ballistic missile capabilities and regional influence. Senior diplomats from Britain, China, […]