Thanks to Laszlo!
Link to promotion (Russian) https://aw.mail.ru/promo/freegold/
Armored Warfare is attracting seasoned tank drivers as best it can. First the Type 59 giveaway, now they even pay WoT gold! Mail.ru is promising to pay all registered players, who research a tier 6 non-premium tank and play one battle in it, 2500 gold to their World of Tanks account. Basically mail.ru will donate to Wargaming for players. And the funniest thing: Wargaming support is calling this fraud.