The background of "Red Alert 2" is that the Soviet Union rose again after being defeated by the allied forces in the previous work and launched a surprise attack on the United States.
The time is about 1990~2000. It can be inferred from the appearance of films such as Yuri Revenge at Hollywood Gate, Rambo, Terminator and Jurassic Park that these films are also released in the fictional world of Red Alert, so the time is modern.