Here's a little more information.
"Two precious fresco icons that date back to the 15th century have been rediscovered on the Spasskaya and Nikolskaya towers of the Moscow Kremlin, Russian Today reports.
The icons, which have always been important religious symbols for the Russian Orthodox believers and after which the two Kremlin towers were named, were plastered over after the fall of the monarchy in Russia and were considered lost forever. Ever since then, one could only see white-painted squares on the places where the icons used to be.
Nikola of Mozhaisk
http://russkiymir.org/en/news/index.php?id4=11886
http://www.russia-ic.com/news/show/10124/