Btw, I knew this would come up now with so many new players. Honestly, that was the first question I asked myself when playing beta. I mean, they even have the model that is used in soviet base. You need to understand the game a bit more to know why developers didn't give bunkers to soviets. I did. You are going to as well.
I´m not a new player. I play the game since preorder. I´m not very good but I´m an avarage player (and sometimes a good player). But I have some limits (i can´t play with keyboard; i only play with the mouse)= I have 52 yo. It´s not easy to me to learn to play otherwise.
But I feel a lot of times that soviet infantary (enginners and conscripts) and some tanks (t34/85 and IS2) are underpowered. I feel that bunkers could help more to defend conquered territory that otherwise is hard to defend..