According to the agreement on military cooperation signed between Azerbaijan and Turkey, the "Indestructible Brotherhood-2021"  joint live fire tactical exercises with the participation of motorized infantry, special forces commandos, and various types of troops of both countries has started in Nakhchivan.  In accordance with the tradition, a ceremony of exchanging the state flags of the two fraternal countries was held during the exercises, which involved formations and units of the Nakhchivan Garrison Troops and the units of the Turkish Armed Forces.
In order to participate in the flag-exchanging ceremony, the flag platoon of the Combined Arms Army moved from Nakhchivan towards the Umid Bridge over the river Araz, and at the same time, the flag platoon of the Republic of Turkey moved from Doghubeyazit to the checkpoint across the state border Sadarak-Umid Bridge.
After reaching the Umid Bridge, the national anthems of Turkey and Azerbaijan were performed as well as the flag-exchanging ceremony was held.
Following the ceremony, a military convoy of the Turkish Armed Forces crossed the Umid Bridge in the direction of the training area, and the servicemen of the fraternal countries were solemnly welcomed in the military units of the Combined Arms Army.