A top U.S. envoy appealed to Iran to accept a “mutual return” to a landmark nuclear agreement with world powers as diplomats are set to gather to negotiate a cap on the Persian Gulf country’s atomic program in exchange for sanctions relief. The statement delivered by Washington’s top International Atomic Energy Agency diplomat late Tuesday acknowledged trust needs to be rebuilt after former President Donald Trump unilaterally applied punishing economic sanctions three years ago, prompting Iran to respond by dramatically increasing its nuclear work. Returning to the deal could allow Iran to ramp up global oil sales. “We are making progress, but much work remains ahead of us,” Louis Bono told a closed IAEA meeting late Tuesday. “Confidence must be rebuilt — in Washington, in Tehran and elsewhere. We further urge Iran to join the U.S. in reaching and implementing an understanding for a mutual return to full compliance.” […]