The decision was made to set up the Assembly of the Seimas of the Republic of Lithuania and the Verkhovna Rada of Ukraine in March 2003 in order to highlight the aspiration to strengthen the inter-parliamentary relations between Lithuania and Ukraine and address the need for considering topical matters in the area of international relations.

In Kyiv on 1 October 2003, the first, and so far the only, session of the Assembly adopted a statement and approved the Assembly’s Rules of Procedure.

According to the Rules of Procedure, the delegations from the Seimas of Lithuania and the Verkhovna Rada of Ukraine, each consisting of 15 members, take part in the work of the Assembly.

Each national Parliament decides on the procedure for appointing members of the delegations.

The official languages of the Assembly are Lithuanian and Ukrainian. English and Russian may be used as working languages.

No membership fees are charged.

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On 8 December 2020, pursuant to Article 81(1) of its Statute, the Seimas formed 10 parliamentary delegations, including its 15-member strong Delegation to the Assembly of the Seimas of the Republic of Lithuania and the Verkhovna Rada of Ukraine, for the 2020–2024 legislative period. The Seimas approved Matas Maldeikis as Head of the Delegation, with Valentinas Bukauskas as Deputy Head.