A Russian drone strike on a passenger bus in southern Ukraine has killed five people and wounded at least seven others.

Russian aerial attacks have killed two civilians and wounded six in central Ukraine, according to local officials.

Russian forces have relentlessly battered Kyiv and nearby cities for a fifth straight day.

Ukraine has intensified its drone attacks on Russia, setting fire to a major oil refinery in the south and killing at least two people, according to Russian authorities.

Ukrainian drones have struck another Russian refinery, igniting a fire and producing massive black smoke.