Three people were killed after Russia attacked a boat carrying evacuees from a flooded area in Kherson, the regional governor said.
Ukraine has been trying to rescue people trapped on the Russia-held eastern bank of the Dnipro River since the Nova Kakhovka dam was destroyed.
Oleksandr Prokudin said Russian troops shelled the evacuation boat and shot a 74-year-old man dead.
The man was trying to rescue a woman from gunfire, Mr Produkin said.
Two police officers were also injured.
The Nova Kakhovka dam burst on Tuesday, releasing a huge torrent of water which quickly flooded vast areas of land on both sides of the Dnipro river.
Ukraine has blamed Russia for "blowing up" the dam, located in a Russian-controlled area of Ukraine. Russia has denied this and has accused Ukraine of being responsible for its destruction.
The BBC has not verified either claim, although it appears likely that Russian forces, who controlled the dam, decided to blow it up in order to complicate Ukraine's ongoing counteroffensive.
เล่นสล็อตเว็บตรงค่ายดัง
