Soviet Infantry, Buildings

Infantry

Tesla Trooper: They can actually attack with the same zapping type attack as a Tesla Coil. You can also use them to bolster Tesla Coils and keep up their charge even if your power plants are knocked out!

Crazy Ivan: Ivan is an explosives freak who plants bombs on anything. One funny demonstration had Ivan strapping bombs on a cow, Yuri mind controlling the cow, and then "driving" that cow into a column of troops for a devastating attack. Cow bombs - the future of RTS.

Soviet Iron Curtain

Soviet Nuclear Power Plant

Yuri: Yuri represents the elite of the Soviet mind control forces. He can mind control any unit in the game and use it in any way the player sees fit. He's also got psionic attacks that can devastate enemy infantry.

Terror Drones: These insect like robots are great defense against tank rushes. They move very fast, and jump inside tanks to destroy them from the inside out. While this happens you'll see the targeted tank rock from side to side before it finally explodes from the internal trauma. Westwood demonstrated one base defended by Tesla Coils, Tesla Troopers to bolster the range and power of the coils, and these Terra Drones to defense against tanks. That defense was pretty much impenetrable to anything not supported by air.

Buildings

Nuclear rocket: The Soviets are not shy about using tactical nukes in their quest for glory. Launching a nuke will set off air raid sirens all across the map. When the nuke lands, it explodes and destroys almost everything within one screen's width of the epicenter. Infantry caught in the blast turn green with radiation and melt like plastic soldiers under a magnifying glass.

Soviet Psychic Sensor

Soviet MCV

Cloning vats: The dastardly Sovs have perfected cloning technology. Whenever a player builds an infantry unit, another one pops out of the cloning vat. If you capture an infantry unit with Yuri, he can enter the cloning vat to give the Soviets the power to build that unit. It's basically similar to how the Allied spy can steal technology.