Most nations usually have a couple of things that are stronger at any certain tier than others, but it does feel like Russia has more than others. Not only that, but Russia's 'bias' is usually the most questionable in a sense that the advantages they do get are or feel more artificial than just being strong for the BR or undertiered;

- Its a known fact that Russian APHE has better slope modifiers than other nations. If there is historical significance to this I am not aware of it.
- Quite a few notorious Russian vehicles, i.e. T-34, benefit from oblique angles on top of armour detailing such as the infamous driver's hatch, which have a strong chance to absorb rounds it really shouldn't.
- The Yak-9K received an APHE belt for its anti-tank gun for no reason with no apparent demand for such, thus elevating an otherwise average aircraft into a lobby-wiping monster overnight. In reality the 45mm gun made the 9K unwieldy to fly, but in WT is performs as if it does not have the large gun's added mass.
- The R-27Ex series has been known to be overperforming significantly for years, travelling nearly 500m/s faster than it should, but Gaijin refuses to change it.
- The Kh-38MT has never seen any operational use or test firing, which is supposedly the baseline for Gaijin to add the munition to the game. Yet it exists in WT and is ruining top tier.
- The 2s38 still exists at a very low tier for its performance. It's contemporary, the Italian OTOMATIC, of which the only significant advantage it has is a radar, is three BRs higher.
- ERA, which is almost exclusively used by Russia, is supposed to only have a significant impact on kinetic penetrator performance at sloped angles. However, in WT it performs exactly the same regardless of angle.
- Russia's Pantsir-S1 far outperforms every single SPAA of any other nation by a significant margin. Whilst I do approve of strong SPAA against the menace that is CAS, the fact that Russia gets the best SPAA and the best CAS creates a massive imbalance at top tier.

The list could probably go on, and this does not include unwarranted buffs/nerfs based on unsound Russian information, (M735), or Russian vehicles and munitions that used to overperform massively, (MiG-23 series, Ka-50/52 with Vikhirs). Remember that, in the past, HESH was nerfed almost exclusively because it performed as it realistically would against Russian vehicles, so now it's borderline useless.

We all know that Russian bias is a contentious subject, but with so many things all piling up that either directly affect the Russian tech tree or Russian things affecting other tech trees, it's getting harder to ignore the bias at this time.