The first big ship carrying grain from a Ukrainian Black Sea port has set sail since Moscow quit a deal in July to allow exports, a Ukrainian deputy prime minister said on Friday, part of Kyiv’s campaign to break Russia’s de facto blockade.

The Aroyat “left the port Chornomorsk after loading 17,600 (metric tons of) Ukrainian wheat for Egypt,” Oleksandr Kubrakov said.

It was the second of two bulk carriers to leave the port this week using what Kyiv calls a new temporary humanitarian corridor. The first, the much smaller Resilient Africa, left on Tuesday, testing the route with just 3,000 tons.

After invading Ukraine last year, Moscow closed off the Black Sea ports from one of the world’s biggest suppliers of grain, in what Kyiv called an attempt to use global food supplies as blackmail.