Through time and space the Soviet war machine is back, this time ready to finally conquer the free peoples of Allied Europe and then... the world.
This tech tree includes structures from ALL Soviet countries, and you won't gain access to all of them in a normal game.
The mod actually has units spread across four tier levels. T1 - basic factories, T2 - Ops. Tower, T3 - Tech Center and T4 - War Palace. Several things are moved higher and lower in the tree to hopefully provide more options and variety in games. Teching up is less vital as earlier tier units are very potent and there are often other strategies and things you can build that make spending time on the tier building inefficient.