Wikipedia - USSR

https://en.wikipedia.org/wiki/Eurasian_Economic_Union

"When the USSR began to fall in 1991, the presidents of Belarus, Kazakhstan and Russia of the founding republics signed the Belavezha Accords on 8 December 1991, declaring that the Soviet Union would cease to exist and proclaimed the Commonwealth of Independent States in its place."

https://en.wikipedia.org/w/index.php?title=Eurasian_Economic_Union&oldid=1215336828