Lasers won’t effectively work, it’s a two part equation, detection and targeting. To neutralize a target using a ground-based laser, you need an enormous power, and still it won’t penetrate a high distance/altitude in the sky, environment factors also to be considered. The detection part is even harder, these small 8in drones are almost impossible to detect unless you can hear it, aka it’s over, because they can fly at 250km/h, too small to be visually detected, acoustic sensors will fail to detect them, and radar will miss it as a false negative since it’s the size of a bird. I have seen some systems trying to combine all that to detect them plus AI for flying pattern detection, but they are far from being reliable in practical applications.

8 inches drone cannot carry much of explosive at all. In order to dump 10 kg load of explosives, you need an “agricultural drone” one that can carry 45kg, since the additional mechanisms and their batteries (and the drone’s backup batteries) are heavy.

Those are bigger and noisier.

DJI ARGAS Series are good starting point.

https://ag.dji.com/mobile

Unless you mean it just can't detect objects that small, my guess is we'll see things calibrate toward a lot more birds being cooked in active war zones vs drones with explosives being let through.

Can radar distinguish from the bird since it’s moving 250km/h?

The small weaponized drones do not fly 250 km/h.