Export prices of Russian wheat fell again last week as the world market eased due to good supply and an extension of the Black Sea grain deal, as well as local expectations of a cut in export duty, analysts said. The deal to allow Ukraine to export its grain safely across the Black Sea was extended last week for two months. The prices of Russian wheat with 12.5% protein content, delivered free on board (FOB) from the Black Sea in June, was $242 a tonne, down $6 from the previous week, the IKAR agriculture consultancy said.