From the 5th of July there will be a marathon event running for 50 days, to do 50 missions to earn the Russian T5 Premium T34 Shielded Medium Tank. The beauty is, you only have to do 30 of them to get it (or just buy it). My video review is in the link below and how you can get it.
I have provided the full stats for the vehicle, and also a comparison to the standard T34 from the tech tree. Also there is a list of what you can earn by the number of points/missions done.