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To my observation the self-perception and the perception by others is inter-connected and both is roughly connected to the proportion of German ancestry. Those who came quickly after 1990 were often of full German descent and those who came the last years rarely do have full German ancestry. These of fully German descent did often distance themselves from carrying on Russian culture and became quickly intergrated. They view theselves as ordinary Germans and are also perceived as that by the other Germans. For such folks there's actually zero problem, except for maybe if they just have arrived. Having the family background of having been in Russia for 200 years is inconspicious in Germany as millions of Germans have also once been in Russia, Poland (proper), Romania, Hungary etc.
Now, those "Germans" that do only partially have German ancestry do stick more to going on with Russian language, socialising only among other such folks etc. This influences both the self-perception and the perception by others in that direction that those are no Germans and no integral part of the German people.
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