Russian President Vladimir Putin has called the attack on the Kakhova dam a "barbaric act".
In his first response since the dam collapsed, Putin has told Turkey's President in a phone call that it's led to a "large-scale environmental and humanitarian catastrophe".
Ukraine and Russia have blamed each other for the disaster.
Ukranian President Vlodimir Zelenskyy earlier accused Russia of detonating an "environmental bomb of mass destruction."
Forty-two thousand people are at risk from flooding and thousands have been evacuated.
Some people awaiting rescue were forced to spend the night on rooftops or in trees because of floodwaters.
Concerns are now turning to environmental factors including the dangers to wildlife, farmlands, settlements and water supplies from the floodwaters and possible contamination from industrial chemicals and oil leaked from the hydropower plant into the Dnipro River.
