Chicago wheat futures rose 1.6% on Friday as news of a Ukrainian attack on a Russian Baltic port and Moscow's rejection of the idea of a Black Sea truce heightened market concerns about a squeeze on exports.
The most-active wheat contract on the Chicago Board of Trade (CBOT) ended the overnight session up 1.6% at $6.792 a bushel.
September wheat BL2U6 on Euronext climbed 2.6%, with technical adjustments before the upcoming expiry of the contract adding to support from reduced Black Sea exports.
Ukraine's military said it struck Russia's Novatek NVTK.MM gas condensate processing complex in the Baltic port of Ust-Luga. While no damage to grain sites was reported, the news raised risks about what is among alternative routes for Russian grain exports given severely reduced Black Sea flows.
"Overnight reports of damage at Ust-Luga suggest the risk is spreading beyond the Black Sea. No major Russian or Ukrainian export corridor now looks really safe," CM Navigator analyst Donatas Jankauskas said in a note.
Russia's rejection on Friday of the idea of a ceasefire with Ukraine in the Black Sea also rekindled market concerns after a Reuters report on Thursday saying Ukraine has sent an offer suggesting a halt to attacks on civilian targets in the Black Sea.