The consequences of the collapse of the USSR included-
The Commonwealth of Independent States came (CIS) into existence and finally, new countries were formed such as Ukraine, Belarus, Georgia, Armenia, etc.
Other changes due to the disintegration of the Soviet Union included:
reunification of Germany in 1990.
splitting Yugoslavia into Serbia, Bosnia, Croatia, Slovenia, etc.
splitting of Czechoslovakia into the Czech Republic and Slovakia.
The disintegration of the USSR signified the end of the Cold War and the USA emerged as the only superpower (unipolarity).