A significant amount of Russian communists are against Lenin's body burial. For now Russian govt. doesn't see a serious reason to engage in conflict with them over someone's body.
I think the most evident similarities should be linguistic, genetic and cuisine.
Sure, Poles have plenty of Celtic and Germanic admixtures and Russians have Finno-Hungarian, Mongol, Tatar, Germanic. But in general genetics should be very similar, my guess.
Fairy tales about Russo/Polish "similarities" are result of ignorace or lies on purpose.
I think the most evident similarities should be linguistic, genetic and cuisine.
Sure, Poles have plenty of Celtic and Germanic admixtures and Russians have Finno-Hungarian, Mongol, Tatar, Germanic. But in general genetics should be very similar, my guess.