Russian-backed separatists who seized control of a modern art space in the Ukrainian city of Donetsk last year have destroyed a monumental sculpture there, according to the exiled directors of the center, known as Izolyatsia, or ‘Isolation.’

Undated video posted online Wednesday by the Izolyatsia foundation from its new home in Kiev appeared to show rebels blowing up the chimney of its gallery in a converted factory in Donetsk. The chimney had been transformed into a giant lipstick tube in 2012 by a Cameroonian artist.