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>I assume it's what's europe would've looked like many hundreds of years ago
Unfortunately the closest much of Russia comes to is interior Scandinavia. If you go to the same latitude as France, Germany, or Poland it's an arid steppe. If you go north to where the the trees are, it's going to be dominated by twiggy short lived species like silver birch and Scotch pine due to the cold. Basically no beech or oak trees, which dominate old forests in western Europe.