Ukrainian President Volodymyr Zelensky on Monday urged NATO to impose a no-fly zone over his country or see its member states attacked by Russia, AFP reported.

"If you don't close our sky, it is only a matter of time before Russian rockets fall on your territory, on NATO territory," Zelensky said in a video address released shortly after midnight.

Sunday, 35 people died and more than 130 were injured when Russian troops launched air strikes on a military training ground outside Ukraine's western city of Lviv, near the border with Poland, local officials said, according to AFP.