President Volodymyr Zelenskyy said—in an interview with CNN—that Ukrainian officials think about 2,500 to 3,000 Ukrainian troops have died in the current war, comparing the figure to what he said are Russia's casualty numbers of 19,000 to 20,000 (Russia has acknowledged 1,351 military casualties), CNN reported. 

Zelenskyy added there are about 10,000 Ukrainian troops who have been injured and that it's "hard to say how many will survive."

Civilian casualties are more difficult to quantify, he said.

"It is very difficult to talk about civilians, since south of our country, where the towns and cities are blocked -- Kherson, Berdyansk, Mariupol further east, and the area to the east where Volnovakha is—we just don't know how many people have died in that area that is blocked," the Ukrainian president said.