Russia's gay rights problem
Kalugin stood protesting against gay rights violations at Palace square where paratroopers celebrated Paratroopers' Day.
Russia decriminalized homosexuality in 1993, but homophobia remains strong. Gay rights activism has heated up in Russia in recent months, after new laws were passed banning so-called "gay propaganda," with some groups calling for a boycott of the 2014 Olympic Games in Sochi.
Russian police arrested dozens of people on after clashes erupted between pro- and anti-gay demonstrators.
Earlier in the year, President Vladimir Putin signed a law that will impose hefty fines for holding gay pride rallies or providing information about the gay community to minors.