Roizman was one of a handful of Kremlin critics who won mayoral posts following a series of big opposition demonstrations as President Vladimir Putin campaigned for office in 2012.
Russia calls its actions in Ukraine a "special military operation" aimed at ensuring its own security and authorities have prosecuted a number of activists for calling it a war or criticising Russia's action.
Ukrainian forces have mounted stiff resistance and the West has imposed sweeping sanctions on Russia in an effort to force it to withdraw its forces.
(Reporting by Reuters; Editing by Robert Birsel)
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