In this photo taken from video released by the Russian Defense Ministry on Wednesday, Aug. 14, 2024, a Su-34 bomber of the Russian air force drops FAB-500 bombs on Ukrainian positions at an undisclosed location. (Russian Defense Ministry Press Service photo via AP)

Ukrainian servicemen ride atop on armoured vehicle at the Russian-Ukrainian border in Sumy region, Ukraine, Wednesday, Aug. 14, 2024. (AP Photo/Evgeniy Maloletka)

In this photo taken from video released by the Russian Defense Ministry on Wednesday, Aug. 14, 2024, Russian soldiers fire Giatsint-S self-propelled gun towards Ukrainian positions at an undisclosed location. (Russian Defense Ministry Press Service photo via AP)

Serhii Zaichenko, 63, school guard walks in the corridor of his school which was heavily damaged after Russian airstrike in Mohrytsia, near Russian-Ukrainian border, Sumy region, Ukraine, Wednesday, Aug. 14, 2024. Zaichenko said two people were killed, including one child. (AP Photo/Evgeniy Maloletka)

Ukrainian servicemen sit inside their APC after returning from Russian Kursk region, near Russian-Ukrainian border, Sumy region, Ukraine, Wednesday, Aug. 14, 2024. (AP Photo/Evgeniy Maloletka)

This image released by Maxar Technologies shows a trench being built southeast of Lgov, west of Kursk, Russia, Monday Aug. 12, 2024. (Satellite image ©2024 Maxar Technologies via AP)

A local woman hauls her bicycle in front of Ukrainian APC near Russian-Ukrainian border, Sumy region, Ukraine, Wednesday, Aug. 14, 2024. (AP Photo/Evgeniy Maloletka)

A Ukrainian armoured vehicle drives at the Russian-Ukrainian border in Sumy region, Ukraine, Wednesday, Aug. 14, 2024. (AP Photo/Evgeniy Maloletka)

Ukrainian servicemen ride atop on armoured vehicle at the Russian-Ukrainian border in Sumy region, Ukraine, Wednesday, Aug. 14, 2024. (AP Photo/Evgeniy Maloletka)

This image released by Maxar Technologies shows a trench from Selektsionnyi to Lgov, Russia, Monday Aug. 12, 2024. (Satellite image ©2024 Maxar Technologies via AP)

Serhii Zaichenko, 63, school guard shows his school which was heavily damaged after Russian airstrike in Mohrytsia, near Russian-Ukrainian border, Sumy region, Ukraine, Wednesday, Aug. 14, 2024. Zaichenko said two people were killed, including one child. (AP Photo/Evgeniy Maloletka)

In this photo taken from video released by the Russian Defense Ministry on Wednesday, Aug. 14, 2024, Russian soldiers fire Giatsint-S self-propelled gun towards Ukrainian positions at an undisclosed location. (Russian Defense Ministry Press Service photo via AP)