The A-20 is the Soviet tier 4 scout tank. In comparison to other tanks of its class, like the German Leopard, the A-20 is easier to hit due to its bigger size, but can compensate for that with its excellent turning ability. Like other scouts, the A-20 boasts advanced radios and excellent maneuverability. It's armament can be considered powerful for it's class: use it fully when in battles against the vehicles of its tier.
A-20 can be accessed from:
BT-7 (Light tank) (In game)
From A-20 you can get access to:
T-34 (Medium tank) (In game)