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Founding state

The Verkhovna Rada never ratified the agreement on membership of the CIS in accordance with the CIS Charter so Ukraine never became a member.

Ukraine did not apply to become an Associate member, nor was it granted by the Council of Heads of States, accordingly Ukraine remained just a Founding state.

Ukraine did participate in the CIS and became an associate member of the CIS Economic Union in 1994, and signed the Commonwealth of Independent States Free Trade Area in 2011.

Ukraine withdrew its representatives from the CIS in May 2018 and stopped actively participating in the CIS, but remained a party to a number of agreements, such as the free trade area.

Although Ukraine was one of the states which ratified the Creation Agreement in December 1991, making it a Founding State of the CIS, it chose not to ratify the CIS Charter as it disagrees with Russia being the only legal successor state to the Soviet Union. Thus it has never been a full member of the CIS. However, Ukraine had kept participating in the CIS, with the consent of the Council of Heads of States, even though it was not a member. Ukraine has never applied for, or been granted, Associate member status.

Following the start of the Russo-Ukrainian war in February 2014, relations between Ukraine and Russia deteriorated, leading Ukraine to consider ending its participation in the CIS. As Ukraine never ratified the Charter, it could cease its informal participation in the CIS. However, to fully terminate its relationship with the CIS, it would need to legally withdraw from the Creation Agreement, as Georgia did previously. On 14 March 2014, a bill was introduced to Ukraine's parliament to denounce their ratification of the CIS Creation Agreement, but it was never approved. Following the 2014 parliamentary election, a new bill to denounce the CIS agreement was introduced. In September 2015, the Ukrainian Ministry of Foreign Affairs confirmed Ukraine will continue taking part in the CIS "on a selective basis". Since that month, Ukraine has had no representatives in the CIS Executive Committee building.

In April 2018, Ukrainian President Petro Poroshenko indicated that Ukraine would formally leave the CIS. On 19 May 2018, Poroshenko signed a decree formally ending Ukraine's participation in CIS statutory bodies.

As of 1 June 2018, the CIS secretariat had not received formal notice from Ukraine of its withdrawal from the CIS, a process that would take one year to complete, following notice being given. The CIS secretariat stated that it will continue inviting Ukraine to participate. Ukraine has stated that it intends to review its participation in all CIS agreements and only continue in those that are in its interests. On 3 May 2023 Ukraine formally withdrew from the 1992 agreement that set up the CIS Interparliamentary Assembly. In 2023 and 2024 Ukraine also withdrew from a number of agreements including the 2001 Commonwealth of Independent States (CIS) agreement on cooperation in the provision of safety of hazardous industrial facilities, the 1996 CIS agreement on cooperation in evacuating nationals from third countries in emergencies, the 1992 Agreement between the State Parties of the Commonwealth of Independent States on social and legal guarantees of the military personnel, persons discharged from military service, and members of their families, the 1992 Agreement on the Establishment of the Council of Commanders of the Border Troops and the Agreement on the Creation of the Interstate System of Documentary Encrypted Communications of the Commonwealth of Independent States.