Watch this Russian tank defeats an anti-tank rocket-propelled grenade with an active protection system (APS) called "Arena."
Popular Mechanics explained how it works:
A tank or other armored vehicle is ringed with several millimeter-wave radars, each pointed outward and assigned a different arc of sky. If the radars pick up an incoming rocket or missile, they track the target and determine if it’s on a collision course with the vehicle. If it is, the APS automatically launches an interceptor munition that pops out of an armored silo located on the tank and terminates the threat.
So the tank kills anti-tank killer rocket with its own anti- anti-tank killer rocket, got it?
Image: First Channel/YouTube