Spot premiums for crude and some refined products in Asia, Europe and Africa have fallen back following a U.S.-Iran deal to end the Middle East conflict, though caution about how soon normal shipping can resume is providing a floor for oil markets.Prices tumbled across the board on Monday after U.S.<p><p>https://www.marinelink.com/news/spot-oil-premiums-fall-usiran-deal-540368</p></p>