How much oak should be in wine?

A barrel is righteously seen as winemaking tool, and has been used since the Roman times...

In the times of the Soviet Union, aging wine in oak barrels was required for the production of brand-name wines.

Presently, a different classification of wines proceeds. However, the technical methods have remained the same, even when speaking of the aging of wine in oak barrels. We shall delve more into this topic...