North-eastern Ukraine city Sumy Governor Dmitry Zhivitsky has said at least six Ukrainians - including a seven-year-old girl - died as a result of a Russian attack on Friday on the northeastern city of Okhtyrka, reports BBC.
A kindergarten and an orphanage were among the reported targets, which Russia has denied.
Ukraine's Foreign Minister Dmytro Kuleba has alleged "war crimes" were committed and has called for an investigation into the incident by the International Criminal Court.