Since the disintegration of the Soviet Union in 9 1, it is now called Russia. If the things mentioned are unique to the Soviet period, continue to the present, or are gone now, they are said to be * * * of the former Soviet Union.

For example, the former Soviet astronaut Gagarin and so on.

The former word is for the latter word, that is to say, there must be substitutes before and after. If there is no substitute word, there is no need to add the previous word. If we only talk about the Soviet Union and Soviet astronaut Gagarin now, people will mistakenly think that they are astronauts from a country called the Soviet Union. Dinosaurs don't need to add the previous word, because dinosaurs disappeared and didn't replace dinosaurs, but now the Soviet Union has been replaced by the Commonwealth of Independent States, so it is necessary to add the previous word before the Soviet Union, which is the former Soviet Union.

At the same time, there are also people's emotions in it. The Soviet Union is not so pleasing to the eye in the eyes of the United States or many developing countries, and its hegemonic line has made many countries suffer a lot. Therefore, it is unworkable and outdated to use prefix to express this national line, which is used to deny what the Soviet Union did in the past.