The Zollburg Pfalzgrafenstein toll castle is seen in the middle of the Rhine river with low water levels, in Kaub, Germany, Monday, Aug. 10, 2026. (AP Photo/Michael Probst)

A pharmacy display shows a temperature of 42 degrees Celsius in Paris during a heat wave, Wednesday, July 29, 2026. (AP Photo/Aurelien Morissard).

A man walks on dried grass in a park, amid drought conditions in London, in London, Sunday, Aug. 9, 2026. (AP Photo/Kirsty Wigglesworth)

People walk over a stone dam, that is normally covered by water, towards the "Maeuseturm" (mice tower) in the middle of the river Rhine in Bingen, Germany Monday, Aug. 10, 2026. (AP Photo/Michael Probst)

Boats are stranded in a side arm of the river Rhine that is running out of water in Mackenheim near Mainz, Germany Monday, Aug. 10, 2026. (AP Photo/Michael Probst)

A Ukrainian "Chaklun" long-range strike drone takes off from a mobile launcher during an operational launch targeting Russian military installations in Crimea, from an undisclosed location in Ukraine on Thursday, Aug. 6, 2026. (AP Photo/Dan Bashakov)

A Ukrainian serviceman prepares a "Chaklun" strike drone used for deep-strike operations against Russian positions in Crimea, in an undisclosed location in Ukraine on Thursday, Aug. 6, 2026. (AP Photo/Dan Bashakov)

Maj. Robert "Magyar" Brovdi speaks during an interview with The Associated Press in an undisclosed location in Ukraine on Friday, Aug. 7, 2026. (AP Photo/Dan Bashakov)