A Russian soldier's killing of a wounded comrade highlights the 'brutal culture' rampant inside Russia's military, war analysts say

• Recent drone footage shows a Russian soldier killing a wounded comrade in combat.
• Experts say the incident highlights violence and disregard among Russian forces.
• Similar past incidents suggest a deep-rooted issue with discipline and internal violence.

Drone footage showing a Russian soldier shooting a comrade hurt in combat highlights the "brutal culture" of "callous" behavior in the Russian armed forces, war experts say.