а можно ли россиянам получать немецкое гражданство, не отказывась от русского?

http://en.wikipedia.org/wiki/German_nationality_law
Although dual citizenship is restricted under German law, it can be held in limited circumstances:
*where a child born to German parents acquires another citizenship at birth (e.g. based on place of birth, or descent from one parent).
*where a German citizen acquires a foreign nationality with the permission of the German government
*where a naturalized German citizen, or a child born to non-German parents in Germany, obtains permission to keep their foreign nationality
A senior Social Democratic Party member Ralf Stegner, who is the interior minister in the regional state of Schleswig-Holstein, has asked the German chancellor to change dual nationality law to allow dual nationality to all citizens of Germany. He feels that Germany should allow multi-nationality to integrate many of the Gastarbeiter who live in Germany.

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where a naturalized German citizen, or a child born to non-German parents in Germany, obtains permission to keep their foreign nationality

Если вы натурализировавшийся гражданин (получили гражданство) или ребенок рожденный не от немецких граждан в германии, тогда можно получить разрешение на сохранение первоначального гражданства

росСионеянину - можно
русскому = нельзя!

Конечно, можно.

В России разрешено двойное гражданство, так что можно

кому ж вы, россияне, в Германии нужны то?

я имею двойное гражданство, русское и греческое, в германие система та же