"A number of Russian (moscovy) noble families are of Lithuanian origin , such as Golitsini. At a later stage Lithuanian nobility mixed with poles , be combining fully polonised. So much for no common history.... "
Of Lithuanian origin– but where is a common history? , Finno-ungaric of “Lithuanian origin’’ were married to Finnic-Ugric of ‘’Russian origin’’ (e.g. Rurik monarch family).
BTW, Golitsyni share roots with Ruriks and also belongs to N1C1 (finnic origin) as do oldest russian and polish aristocracy , but that is just few percent of population in Russia currently, if you meant that by common history, then I agree.
The fact that territory of modern Poland, Baltic states and Russia were intensively populated by N1c1 (Finnic-Ugric tribes) 500-1000 years does make current nations (slavs and balts) closer.
Poles are currently Slavic (R1a y-haplogroup)
Balts are mixture of Finnic (N1) , Slavic (R1a) ,Germanic (R1b)
Russians (mostly) and Ukrainians are Slavic (R1a)
"In a way it resembles the problem with a separate Austrian identity. They always say they are not Germans.....

"
Hmm, I might be wrong but I think I can distinguish south Germans , Austrians and Swiss.
Servus !