"On Sunday the protest artist Petr Pavlensky sat naked on Red Square and drove a nail through his scrotum and into the pavement."

"Pavlensky had staged disturbing protests before."

In July of last year, he sewed his mouth shut and stood outside a cathedral in St. Petersburg in a show of solidarity with the jailed art collective Pussy Riot. In May he had himself wrapped, naked, in a cocoon of barbed wire and placed on the steps of the St. Petersburg legislature. He lay immobile while the police hunted for a pair of garden shears, severed the wire and then struggled to avoid being cut themselves. That time Pavlensky was protesting a series of restrictions on freedom of speech and of assembly....

Each of these actions required the police to deal with Pavlensky’s body — something Russian law enforcement officials almost never have to do, even though they routinely mangle, maim and kill protesters, convicts and perceived violators of rules and laws.