MAKHACHKALA, Russia — At a certain point last summer, when snipers on rooftops began picking off police officers, Col. Mukhtar Mukhtarov’s wife blocked the door with her body and refused to let him leave home in his uniform.

For 25 years, it had been one of the great joys of Colonel Mukhtarov’s life to walk the streets in his red-striped police cap. But by last summer all that had been turned so thoroughly on its head that he quietly went back to his bedroom to change into civilian clothes.

His son Gassan, a 20-year-old beat officer, has known the job only this way, thick with fear. He changes in his car outside the station house. Aware that militants often follow police officers for days before killing them — his neck sometimes prickling with the sense of being watched — Gassan Mukhtarov swaps license plates with friends to make himself harder to track. He is still not safe. He knows that.

“They’ve known who I was from the first day,” he said.

It is all a measure of how thoroughly order has broken down in the Russian region of Dagestan, in the North Caucasus. Fifty-eight police officers were killed in attacks here last year, according to the republic’s Interior Ministry, many of them while running errands or standing at their posts. Last month alone, according to press reports, 13 officers were killed in bombings and gangland-style shootings.