Refugees flood into Lviv from Kherson. (Photo: Greg Mills) 
"It is a very slow process, because we value people, because we need as many Ukrainians as possible to come back home," said Oleksiy Arestovych, an adviser to President Volodymyr Zelensky.
"There will be no quick success ... a quick success always means a lot of blood," he said in a Youtube interview.
Earlier in the day, a regional official said Ukrainian forces had had "successes" in three areas of the Russian-occupied region of Kherson. Kyiv announced the start of a southern push to retake territory on Monday. Read full story
(Reporting by David Ljunggren; Editing by Jonathan Oatis.)