Ukraine is preparing for a major Russian operation in the east of the country, now that Russian troops have withdrawn from the areas around the capital, Kyiv.
Foreign Minister Dmytro Kuleba said the battle for the Donbas region would remind the world of World War Two.
Mr Kuleba asked Nato countries to provide weapons to fight the Russians. The Western alliance's secretary general said Nato was ready to strengthen support, even though he did not give details on what weapons it would provide.
