This photo taken on May 21, 2026 shows the Gazela Bridge (front) over the Sava River in Belgrade, Serbia. Belgrade, the capital of Serbia, serves as the country's political, economic, cultural and scientific research center. The Danube and the Sava rivers converge at Belgrade, where profound history and culture integrate with picturesque natural landscapes. (Photo by Wang Wei/Xinhua)

This photo taken on May 22, 2026 shows a view of the Palace of Serbia in Belgrade, Serbia. Belgrade, the capital of Serbia, serves as the country's political, economic, cultural and scientific research center. The Danube and the Sava rivers converge at Belgrade, where profound history and culture integrate with picturesque natural landscapes. (Photo by Wang Wei/Xinhua)

This photo taken on May 21, 2026 shows a view of the National Museum in Belgrade, Serbia. Belgrade, the capital of Serbia, serves as the country's political, economic, cultural and scientific research center. The Danube and the Sava rivers converge at Belgrade, where profound history and culture integrate with picturesque natural landscapes. (Photo by Wang Wei/Xinhua)

This photo taken on May 21, 2026 shows a view of the Kalemegdan Fortress in Belgrade, Serbia. Belgrade, the capital of Serbia, serves as the country's political, economic, cultural and scientific research center. The Danube and the Sava rivers converge at Belgrade, where profound history and culture integrate with picturesque natural landscapes. (Photo by Wang Wei/Xinhua)

This photo taken on May 22, 2026 shows the Ada Bridge over the Sava River in Belgrade, Serbia. Belgrade, the capital of Serbia, serves as the country's political, economic, cultural and scientific research center. The Danube and the Sava rivers converge at Belgrade, where profound history and culture integrate with picturesque natural landscapes. (Photo by Wang Wei/Xinhua)

This photo taken on May 21, 2026 shows the scenery along the Sava River in Belgrade, Serbia. Belgrade, the capital of Serbia, serves as the country's political, economic, cultural and scientific research center. The Danube and the Sava rivers converge at Belgrade, where profound history and culture integrate with picturesque natural landscapes. (Photo by Wang Wei/Xinhua)

This photo taken on May 22, 2026 shows the scenery along the Sava River in Belgrade, Serbia. Belgrade, the capital of Serbia, serves as the country's political, economic, cultural and scientific research center. The Danube and the Sava rivers converge at Belgrade, where profound history and culture integrate with picturesque natural landscapes. (Photo by Wang Wei/Xinhua)

This photo taken on May 21, 2026 shows the building of the Ministry of Finance of the Republic of Serbia in Belgrade, Serbia. Belgrade, the capital of Serbia, serves as the country's political, economic, cultural and scientific research center. The Danube and the Sava rivers converge at Belgrade, where profound history and culture integrate with picturesque natural landscapes. (Photo by Wang Wei/Xinhua)

This photo taken on May 21, 2026 shows a view of the National Theater in Belgrade, Serbia. Belgrade, the capital of Serbia, serves as the country's political, economic, cultural and scientific research center. The Danube and the Sava rivers converge at Belgrade, where profound history and culture integrate with picturesque natural landscapes. (Photo by Wang Wei/Xinhua)

This photo taken on May 21, 2026 shows the House of the National Assembly of the Republic of Serbia in Belgrade, Serbia. Belgrade, the capital of Serbia, serves as the country's political, economic, cultural and scientific research center. The Danube and the Sava rivers converge at Belgrade, where profound history and culture integrate with picturesque natural landscapes. (Photo by Wang Wei/Xinhua)