Russia lost two Pantsir-S1 anti-aircraft missile and gun systems and one OSA air defense system, as well as two S-300 air defense systems, according to Ukraine's military and a wa

Russian aviation authorities said the Azerbaijan Airlines plane had hit a flock of birds. But some experts cast doubt on that account, pointing to footage showing apparent holes in the fuselage.

The Azerbaijan Airlines plane flew hundreds of miles off its scheduled route from Baku to Grozny, and crashed on the eastern shore of the Caspian Sea. Russia's aviation watchdog said a bird strike might have been the cause.

Two Russian anti-missile Pantsir-S1 systems and one OSA anti-aircraft vehicle were damaged or destroyed by Ukraine's Navy on Jan. 6, the military branch claimed.

Ukrainian navy sailors destroyed 3 Russian air defense systems in southern Ukraine over the last day. These are the Pantsyr-S1 and the OSA air defense systems, according to the Ukrainian Navy. The Ukrainian Navy destroyed three Russian air defense systems.