
Russia's grain exports are constrained by limited port infrastructure at home. Since Moscow annexed Crimea in 2014, Russian traders can no longer use Ukraine's Black Sea ports, which can handle 52 million tonnes of grain.
Shipments from Crimean ports Sevastopol and Kerch have also been complicated by legal issues.
Reduced access to Black Sea export capacity tightens Russia's effective export flow, which can support wheat and corn offer prices for buyers. The impact is gradual and largely already priced in, so the move is modest.
After 163 past neutral logistics events, WHEAT moved a median +0.1% over 5 sessions (53% higher; middle half -1.3% to +1.1%), and -0.3% over 20.
After 284 past neutral logistics events, CORN moved a median -0.0% over 5 sessions (49% higher; middle half -1.3% to +1.4%), and -0.2% 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.