People visit the Sky of Russia hot-air balloon festival in Ryazan region, Russia, on Aug. 9, 2024. The 22nd ballooning festival "Sky of Russia" is held here from Aug. 4 to 12, and more than 30 teams are featured in the festival. Photo: Xinhua

A girl poses for photos in a hot-air balloon during the Sky of Russia hot-air balloon festival in Ryazan region, Russia, on Aug. 9, 2024. The 22nd ballooning festival "Sky of Russia" is held here from Aug. 4 to 12, and more than 30 teams are featured in the festival. Photo: Xinhua

People inflate a hot-air balloon during the Sky of Russia hot-air balloon festival in Ryazan region, Russia, on Aug. 9, 2024. The 22nd ballooning festival "Sky of Russia" is held here from Aug. 4 to 12, and more than 30 teams are featured in the festival. Photo: Xinhua

People take photos of a hot-air balloon during the Sky of Russia hot-air balloon festival in Ryazan region, Russia, on Aug. 9, 2024. The 22nd ballooning festival "Sky of Russia" is held here from Aug. 4 to 12, and more than 30 teams are featured in the festival. Photo: Xinhua

Hot-air balloons fly during the Sky of Russia hot-air balloon festival in Ryazan region, Russia, on Aug. 10, 2024. The 22nd ballooning festival "Sky of Russia" is held here from Aug. 4 to 12, and more than 30 teams are featured in the festival. Photo: Xinhua

A participant prepares a hot-air balloon during the Sky of Russia hot-air balloon festival in Ryazan region, Russia, on Aug. 10, 2024. The 22nd ballooning festival "Sky of Russia" is held here from Aug. 4 to 12, and more than 30 teams are featured in the festival. Photo: Xinhua

People inflate a hot-air balloon during the Sky of Russia hot-air balloon festival in Ryazan region, Russia, on Aug. 9, 2024. The 22nd ballooning festival "Sky of Russia" is held here from Aug. 4 to 12, and more than 30 teams are featured in the festival. Photo: Xinhua

Hot-air balloons are illuminated during the Sky of Russia hot-air balloon festival in Ryazan region, Russia, on Aug. 9, 2024. The 22nd ballooning festival "Sky of Russia" is held here from Aug. 4 to 12, and more than 30 teams are featured in the festival. Photo: Xinhua

Hot-air balloons fly during the Sky of Russia hot-air balloon festival in Ryazan region, Russia, on Aug. 10, 2024. The 22nd ballooning festival "Sky of Russia" is held here from Aug. 4 to 12, and more than 30 teams are featured in the festival. Photo: Xinhua

Hot-air balloons fly during the Sky of Russia hot-air balloon festival in Ryazan region, Russia, on Aug. 10, 2024. The 22nd ballooning festival "Sky of Russia" is held here from Aug. 4 to 12, and more than 30 teams are featured in the festival. Photo: Xinhua

A pilot inflates a hot-air balloon during the Sky of Russia hot-air balloon festival in Ryazan region, Russia, on Aug. 10, 2024. The 22nd ballooning festival "Sky of Russia" is held here from Aug. 4 to 12, and more than 30 teams are featured in the festival. Photo: Xinhua

Hot-air balloons are illuminated during the Sky of Russia hot-air balloon festival in Ryazan region, Russia, on Aug. 9, 2024. The 22nd ballooning festival "Sky of Russia" is held here from Aug. 4 to 12, and more than 30 teams are featured in the festival. Photo: Xinhua

People pose for photos inside a hot-air balloon during the Sky of Russia hot-air balloon festival in Ryazan region, Russia, on Aug. 9, 2024. The 22nd ballooning festival "Sky of Russia" is held here from Aug. 4 to 12, and more than 30 teams are featured in the festival. Photo: Xinhua