This video appears to show a Russian soldier executing his comrade after his comrade is wounded by a Ukrainian FPV Drone. While I believe that this occurred, there is no way of determining if the wounded soldier was complicit in the act.
The choice of footwear is more interesting in this particular video.
These appear to be Adidas sneakers this may indicate that the Russian supply system is unable or unwilling to equip their soldiers with anything more than weapons or ammunition even after two years of war.
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Did a Russian Soldier "Finish Off" his wounded Comrade