Wheat prices rose more than 3% on Friday to above $6.70 a bushel, lifting weekly gains to over 5% and marking the market's strongest performance since mid-July. The move was driven by renewed fears over Black Sea exports as the Russia-Ukraine conflict disrupted grain shipping from a region that remains central to global supply. Russia and Ukraine are projected to account for almost 30% of world wheat exports in the 2026/27 season, making prices sensitive to any extended interruption. Supply worries deepened after Russia stopped grain loadings at its main Black Sea and Azov Sea ports, including all three major terminals in Novorossiysk, following Ukrainian drone attacks earlier in the week. The stoppages could curb Russian exports further this month and tighten global availability, although reports that Ukraine proposed halting attacks on civilian targets in the Black Sea pointed to a possible diplomatic opening.