Several explosions took place on Saturday morning at the port of the city of Odessa in southern Ukraine, reports say BBC.
The explosions come less than a day after Moscow and Kyiv reached an agreement to allow the export of millions of tons of grain blocked by the war.
According to the agreement, Russia undertakes not to attack ports while grain is being transported.
UN Secretary General António Guterres and EU foreign representative Josep Borrell condemn the robot shelling against the port of Odessa.
Watch Zelenskyy on the attack in the player above.