Russian drones attacked Danube River port infrastructure in southern Ukraine on Sunday, injuring at least two people. The attack targeted critical grain export routes, just a day before Russian President Vladimir Putin and Turkish President Tayyip Erdogan were due to meet to discuss a deal to resume grain exports from Ukraine.

The Ukrainian military said air defense systems shot down 22 of the 25 Iranian-made Shahed drones launched by Russia. However, the attack still caused damage to port facilities and infrastructure.

The Ukrainian president’s chief of staff Andriy Yermak accused Russia of “terrorist” attacks, saying they were aimed at provoking a global food crisis.

The Black Sea grain deal, reached in July 2022, aimed to alleviate a global food crisis. Ukraine is a major producer of grains and oilseeds, and the interruption to its exports after the outbreak of war in February last year pushed global food prices to record highs.

Russia has complained that under the deal its own food and fertilizer exports faced obstacles and that not enough Ukrainian grain was going to countries in need.

The attack on the Danube River port is a major setback for Ukraine’s efforts to export grain and could further exacerbate the global food crisis.