Sri Lanka, June 19 -- Iran's Speaker and chief negotiator Mohammad Bagher Ghalibaf warned that Iran's "finger is on the trigger," adding that if diplomacy fails, Tehran would again respond "with the language of power."

"If it doesn't get done in 60 days, it's all right," Trump said at the G7 summit. "We go back to bombing." That reflects the central tension of the agreement: it is both a peace framework and a warning of renewed war.

The United States and Iran have signed an initial peace agreement aimed at ending their latest war and reopening key global trade routes, in what is being described as one of the most significant diplomatic breakthroughs in recent years. But, even as the deal takes effect, major questions remain over wheth...