- On 17 July 2023, the Russian Federation withdrew from the Black Sea grain initiative and stated that it would not guarantee that it will not attack civilian vessels after that date. The Ukrainian defense ministry mirrored Russia’s threats to ships at sea.
- After that, Russia launched massive missile attacks on Odesa and the region with missiles and drones, destroying ports, granaries, residential buildings, and other facilities.
- NATO has condemned the Russian attacks but has thus far only vowed to increase surveillance. Meanwhile, Ukraine has changed the course of its grain corridor so that it stays within Romanian waters. Reportedly, the US declined Ukrainian requests to escort commercial vessels in the waters of NATO countries to ensure that the grain corridor keeps functioning.
- The Institute for Study of War has observed that Russia seems intent on enforcing a de-facto naval blockade of the Black Sea by intimidating civilian vessels in it. Particularly, a Russian warship told a ship that sailing to Ukraine could get it treated as a military target, according to an intercept shared by Ukrainian officials on 28 July.
- Nevertheless, on 31 July, merchant vessels sailed through Ukrainian territorial waters to ports on the Danube and Ukraine's Navy opened up registration for civilian ships to use the new corridors in the Black Sea.
- Since then, ships are successfully sailing from Ukrainian ports through the corridors.
- Frontline report: Russia relocates Black Sea Fleet as Ukrainian threat looms
- Ukraine’s key Black Sea ports resume grain shipments despite Russian threats
- Romania and Ukraine work together to regulate Ukrainian grain exports
- Ukraine’s economy suffers as Russia destroys 280,000 tons of Ukrainian grain