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CSIS analysis says mutual Russian and Ukrainian attacks on Black Sea and Sea of Azov shipping and export infrastructure have largely suspended traffic through Ukraine's ports, which previously handled about 90% of its agricultural exports. Russia has also suspended exports from its highest-capacity grain terminals, and the attacks threaten global fertilizer trade.
Removing a large share of world wheat and corn trade from the market tightens supplies and supports prices, while fertilizer disruption raises input costs for future crops.
csis.orgCaitlin Welsh, Emma Curtis, Joseph GlauberSep 11, 2026After 361 past bullish geopolitics events, WHEAT moved a median +0.7% over 5 sessions (58% higher; middle half -1.4% to +3.7%), and +1.3% over 20.
After 323 past bullish geopolitics events, CORN moved a median +0.5% over 5 sessions (57% higher; middle half -1.5% to +2.9%), and +0.9% over 20.
After 205 past bullish geopolitics events, UREA moved a median +0.4% over 5 sessions (53% higher; middle half -2.1% to +3.0%), and -0.4% over 20.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.
Mutual Russia-Ukraine attacks suspended traffic through Ukrainian ports and Russian terminals, a supply and trade-flow shock that supports global grain and corn prices.
