How to protect from drones "Shahed"

In the war against Ukraine, russians began to use Iranian-made kamikaze drones Shahed-136, marked as "Geran-2".

There are proven facts of using these drones on the front line and against big cities in the south of our country. The enemy attacks infrastructure facilities and residential buildings with it.
What is known about these drones and how to counteract them?

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