2 points
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Say you’re trying to defend against something like a Shahed-136. It can hit pretty much anywhere in Ukraine. You can’t stick an AA gun on everything that Russia might consider trading a Shahed-136 for.
As far as I know, the routine in the current war is - the AA gun is on a truck that moves 80 km/h, the drone comes in slower than 300 km/h, one or multiple truck crews position themselves on likely vantage points for intercepting, and the rest is luck.