There is 1 new Allied Structure in Yuri's Revenge.
Robot Control Centre: This structure (battle lab required before it can be built) allows a player to construct robot tanks - if a base loses power and the centre becomes inactive then so will all of the players robots tanks..
Force shield: Another superweapon, the force shield is a single shot defensive measure that, for a few seconds, puts up a force field around the base. This shield will protect from all superweapon attacks while it's active, but once it powers down, it will completely drain the base of all its power, leaving it vulnerable to attack. When used precisely, however, the force shield can be a lifesaver. Every single side has this weapon - which has no actual structure but requires that a battle lab is built to access it.