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Странно, разве на московском гербе рыцарские латы и нет нимба?[/quote]
They change it regularly. The modern coat of arms (it's effective since 1993) is based on its first official version (1781).
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Yes, it's Saint George. He's a patron saint of Russia and Moscow and one of the most popular saints here.
http://www.georgi-prague.orthodoxy.ru/Georgi_Ikona3.jpg

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I believe there's no such thing as 'Russian traditional tatoo" (except of prison tatoos, which I wouldn't recommend ;)). Tatoos with religious symbolics are also common/popular only among criminals....