US wheat futures jumped to the highest in more than a week, as disruptions to shipping in the Black Sea raised the prospect of supply shortages from the crucial grain-growing region.

Turkey temporarily halted Black Sea transits for its vessels over the weekend amid heightened security risks related to the Russia-Ukraine war. The country’s foreign minister, Hakan Fidan, called for a “moratorium” on attacks in the region.

Market volatility remains high as the industry monitors the situation. The current disruptions in the Black Sea are driving significant price movements in US wheat futures.