The EMP Mines are a hidden defense used by China which essentially act as a deterrent for both infantry and vehicles.
EMP Mines are simple defenses used at choke points or other important locations. Though the blast of a Mine can kill or heavily injure infantry, its most prominent feature is that it disables enemy vehicles for a large amount of time. This gives a Soviet commander either more time to set up defenses, or to trap and then destroy helpless enemies. Placing an EMP Mine on a single cell will result in 4 more appearing nearby, wherever free space is available.