Have you ever seen any evidence to prove his or his associates guilt? Just because he was charged with anything makes him not guilty. Basically he was imprisoned for about 10 years for alleged tax evasion + for "stealing" crude oil.
p.s. I have seen a lot of the original materials of the cases and I can assure you that State failed to prove his guilt.
With Navalny cases (yes, he and his associates have been charged with many things including stealing a picture) it has reached the whole new dimension.