President Donald Trump has remained notably silent about the deal despite US sources telling AFP it only needed his sign-off, underscoring the unpredictability of talks three months after the conflict engulfed the Middle East and shook the global economy."We place no trust in guarantees or words; only actions matter. No step will be taken before the other side acts first," Iran's Mohammad Bagher Ghalibaf wrote on X.The parliament speaker, who led Tehran's delegation at peace talks with the US in Pakistan last month, also warned that Iran had gained leverage not "through talks, but through missiles" fired at US bases and allies in the region when war broke out on February 28.Hopes of an agreement had risen on Thursday after US officials were positive about the direction of diplomacy."It's hard to say exactly when or if the president is going to sign the MOU," Vance told reporters on Thursday. "We're going back and forth on a couple of language points. We've made a lot of progress here."Optimism around a possible US-Iran deal boosted Asian stock markets on Friday, while oil prices receded slightly.Energy markets have whipsawed this week as investors parse the chances of an agreement that could potentially resume normal shipping through the crucial Strait of Hormuz.