Latest developments:

• U.S. President Joe Biden to host NATO chief Jens Stoltenberg for talks Monday with support for Ukraine at the top of the agenda ahead of next month's NATO summit.
• South African President Cyril Ramaphosa's office said Thursday he spoke by phone with Russian President Vladimir Putin about the upcoming visits to Russia and Ukraine by a delegation of African leaders who are seeking to help resolve the conflict.

Ukrainian President Volodymyr Zelenskyy said Thursday he visited the Kherson region where thousands of people are dealing with the effects from flooding following the destruction of the Kakhovka dam.

Zelenskyy shared a video on Telegram of him meeting with officials and said they discussed evacuations, restoring the region's ecosystem and the military situation in the area.

That followed his nightly address Wednesday in which he called for a "clear and quick response from the world."

He said "large-scale efforts are needed" including the help of groups such as the International Committee of the Red Cross.

The ICRC said earlier Wednesday it was closely coordinating with the Ukrainian Red Cross to support the humanitarian response to the dam's destruction.

Ukrainian Foreign Minister Dmytro Kuleba said NATO Secretary-General Jens Stoltenberg "promised NATO mechanisms will be used to provide humanitarian assistance.' Kuleba and Stoltenberg announced they would lead a meeting Thursday with NATO allies to discuss the situation.

The governor of the Kherson region said Thursday about 600 square kilometers were under water.

Governor Oleksandr Prokudin said about two-thirds of the flooded land was on the side of the Dnipro River occupied by Russia, while one-third was on the side still under Ukrainian control.

Prokudin said efforts to evacuate people from flooded areas were ongoing.

The hydroelectric dam collapsed Tuesday, with Russia and Ukraine blaming each other for the destruction.

Some information came from The Associated Press, Reuters and Agence France-Presse.