Ukraine has exported about 13 million tons of merchandise on some 400 ships since setting up a protected maritime corridor in August to fend off Russian threats, a government minister said Saturday.

While Ukraine had few military achievements on land in 2023, on the Black Sea it has pushed Russia’s much larger navy away from its coasts, allowing the resumption of grain exports.

Infrastructure Minister Oleksandr Kubrakov said he was “grateful” to Ukraine’s international partners “for ensuring the operation of the corridor in conditions of military aggression.”

The corridor was created in August to link Ukraine’s ports to the Bosphorus Straits, several weeks after Moscow refused to agree on a new accord to allow cereal exports through the contested Black Sea.

The now-defunct accord had allowed Ukraine to export nearly 33 million tons of cereals and other foodstuffs over a year.

The sea route is particularly important now because several land border crossings have been blocked in recent months by Polish truckers unhappy with Ukrainian competition.

Russia had threatened to target ships arriving and leaving Ukrainian ports and has attacked port and grain storage facilities.

A Panamanian-flagged grain carrier headed to a Ukrainian port hit a mine this week, wounding two sailors.

On Saturday, Ukraine President Volodymyr Zelenskyy saluted his country’s maritime success, claiming that his forces had “reconquered the sea” this year.