Femen leader Inna Shevchenko wrote on Twitter, explaining that the stunt was intended to "denounce the hypocrisy of this November 11th [Armistice Day], which celebrates peace with the greatest dictators, racist, homophobic, sexist and anti-liberty [leaders] of the planet."
It is the second time the Roshen store has been targeted in protest against Petro Poroshenko.
Kiev wants a European future, but LGBT rights remain neglected.
The women from the Femen activist group had "Heil Le Pen" and "Stop Fascism" written on their breasts.
The sex worker's trade union say calls for criminalisation are fuelled by an ulterior motive to send home illegal migrants.
"Our voices must be louder than the sound of bullets," says Ukrainian FEMEN activist Inna Shevchenko.
Strauss-Kahn, 65, is accused of instigating parties he knew involved prostitutes between 2008-2011.
The Femen women's rights activist was freed after stealing a baby Jesus figurine on Christmas Day bare-breasted.
The Ukrainian woman was arrested on Friday and has been questioned by a judge