A huge billboard that shows Serbian soldiers and reads: "We serve Serbia!" displayed on the former Serbian army headquarters, destroyed during NATO's bombing campaign, in Belgrade, Serbia, Sunday, March 24, 2024. Serbia marks the 25th anniversary of beginning of the NATO air-campaign in 1999, on Sunday. (AP Photo/Darko Vojinovic)
People set on a truck a Russian flag, that reads: "Pray to God, hold on to Russia", prior to a rally in front of the former Serbian army headquarters, destroyed during NATO's bombing campaign, in Belgrade, Serbia, Sunday, March 24, 2024. Serbia marks the 25th anniversary of the beginning of the NATO air-campaign in 1999, on Sunday. (AP Photo/Darko Vojinovic)
A huge billboard that shows Serbian soldiers reading: "We serve Serbia!" displayed on the former Serbian army headquarters, destroyed during NATO's bombing campaign, in Belgrade, Serbia, Sunday, March 24, 2024. Serbia marks the 25th anniversary of beginning of the NATO air-campaign in 1999, on Sunday. (AP Photo/Darko Vojinovic)