flyingtiger Incredible trip 🙂
From October 30, 2023, the Mir payment system tourist card is available in Azerbaijan. By passing the identification procedure, citizens residing in Azerbaijan can open a remote account in a Russian bank and receive a bank card upon arrival in Russia. Although, this is very new and I don't know how it is being applied.
I have looked on the UnionPay website and have not found any bank in Azerbaijan that issues UnionPay cards.
You can also apply for a Tinkoff card for foreigners upon arrival in Russia. More information here: https://russiable.com/open-bank-account-russia/
Where do you take the train to Berlin?