You are in the right direction. Russia is the closest to the answer but still not it. Keep going
Closest and largest Eastern European country is Ukraine however there are Asians further west such as Hungary. The person is from one country but she could pass up anywhere in several Eastern European countries.
Lol people in Hungary are not Asians. Hungarians are genetically European with very minor to none Asian DNA. There were Asian invaders like Huns, Magyars to Hungary, yes but they hardly contribute to or impact the autosomal profile of modern day Hungarians.
She is not from Ukraine but you are very close. You have to keep going down into Balkans and you will get the answer.
And nope she can't pass anywhere in Eastern Europe, she can only pass as an Asian tourist or recent migrant but definitely not as a local.