"People should not see a gray bottom". What prevents to decorate the Russian cities to modern artists?

In Moscow appears more and more street art works — and not only small graffiti, but also muralov — huge images on walls. The part from them is promptly painted over by municipal services, the part remains in the city for a long time. Whether owes the street fine arts be free? Whether artists on walls can draw everything, what they want? How affairs with street art in Europe are? About all this "Moslenta" talked to Ali-zade Elchin, acted curator of the "monumental painting" direction on annual review of the modern art Moscow "Here and now...