Kyiv did not provide details of the Russian regrouping but said the forces continued heavy artillery and mortar shelling and air assaults.
Estonian Prime Minister Kaja Kallas has been a leading critic of Russia and has urged European businesses to cut ties with Moscow.
Russia acknowledges having transferred thousands of children out of Ukraine, but says this has been done exclusively to protect orphans and children abandoned in the war zone.
Since Russia invaded Ukraine in February 2022, more than 200,000 civilians and military personnel have been injured, with 20,000 having undergone amputation.
Ukraine ranks 116th out of 180 countries in campaign group Transparency International's latest Corruption Perceptions Index, with the last placed country seen as most corrupt.
In an interview on Ukrainian television, Lozhenko said about 600 people had been evacuated from the area in the past 10 days, more than 120 of them children.
Ukraine has recaptured a settlement in the Donetsk region from Russian forces, according to Ukraine's Deputy Defense Minister.
Belarus, the Kremlin's closest ally, initially supported the Russian invasion, opening its borders to Russian troops marching on Ukraine's capital Kyiv.
About 14,000 Ukrainian refugees who have arrived in Israel since the onset of the war are currently ineligible to receive health services. Is a solution on the horizon?
"It's an unprecedented situation. Israel, having previously prioritized aiding Ukrainian war refugees, now seems to be regressing," Yair Smolyanov of the One Million Lobby said.
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