The first major accord between the countries since the February invasion of Ukraine aims to ease the "acute hunger" that the United Nations says faces an additional 47 million people because of the war.
Russian long-range cruise missiles killed three people in Ukraine's central city of Dnipro when they hit a space rocket plant and a nearby street, local officials say.
Kyiv's relations with Germany, which is heavily reliant on Russian energy supplies and also Europe's biggest economy, have been a particular sensitive matter.