Jan, nice to see you are still collecting
Interesting picture, and I suppose anything is possible, but unless there are proof that the Germans faked Russian stars I would not consider this as an initial option. Are there any other known instances they actually did this? The way I see it, it is always dangerous to do so since it could easily hit back and hurt yourself more than your enemy....
From the books published most Russian Ar 196 came from Bulgaria and were erected post war. Likewise an Ar 196 was handed over to the Soviets by the Finns in late 1944. This one was still in German camouflage in Finnish service and was probably handed over as is.
Neither can it be totally disregarded that the Soviets in fact DID capture some Luftwaffe operated Ar 196 during the war.
From the photo it certainly looks like there is a German badge on the nose, but not possible to ID straight off.
No idea if it is possible to identify the vessel
Cheers
Stig