Yes there was, what is this then? A letter from Vivian Reding who was Vice President of the European Commission Justice, Fundamental Rights and Citizenship.
https://archive2021.parliament.scot/..._2014__pdf.pdf
Dear Ms McKelvie,
Thank you for your letter of 10 March 2014.
The European Union has been established by the relevant treaties among the Member
States. The Commission, as the guardian of those treaties, is responsible for overseeing their
implementation, including the implementation of provisions related to the accession of any
European State to the Union.
The Commission's position on the issue that you raise has been stated on a number of
occasions since 20041
. The Treaties apply to the Member States. When part of the territory
of a Member State ceases to be a part of that State, e.g. because that territory becomes an
independent state, the treaties will no longer apply to that territory. In other words, a new
independent region would, by the fact of its independence, become a third country with
respect to the Union and the Treaties would, from the day of its independence, not apply
anymore on its territory.
Under Article 49 of the Treaty on European Union, any European state which respects the
principles set out in Article 2 of the Treaty on European Union may apply to become a
member of the EU. If the application is accepted by the Council acting unanimously after
consulting the Commission and after receiving the consent of the European Parliament, an
agreement is then negotiated between the applicant state and the Member States on the
conditions of admission and the adjustments to the Treaties which such admission entails.
This agreement is subject to ratification by all Member States and the applicant state.
Yours sincerely,
Ms Christina McKelvie, Convener
European and External Relations Committee
