Speaking on the sidelines of a meeting of European Union foreign ministers in Brussels, Baerbock accused Russia of blackmail and trying to use the grain as a weapon at the expense of the world's poorest.

Russian President Vladimir Putin has accused Western countries of "perverting" the grain deal, brokered by the United Nations and Turkey.

"Hundreds of thousands of people, not to say millions, urgently need the grain from Ukraine, which is why we are working with all our international partners so that the grain in Ukraine does not rot in silos in the next few weeks, but reaches the people of the world who urgently need it," Baerbock said.

(Reporting by Matthias Williams and Tassilo Hummel, Editing by Friederike Heine)