BT-2 is Soviet scout tank. It starts the branch directly to the Soviet best medium tanks such as T-54. BT-2 is one of the fastest tanks in game, which makes it great for scouting or getting to a certain point before others can get to it. It can mount a 20mm or a 37mm gun. It's disadvantages are fairly slow turning speed and weak armor.
BT-2 can be accessed from:
MS-1 (Light tank) (in game)
From BT-2 you can get access to:
BT-7 (Light tank) (in game)