# Celtic nations independence movement > Live situation record from CLSTR: https://clstr.news/situations/celtic-nations-independence-movement > Updated: 2026-09-27T06:42:02.000Z. Sources: 9. Developments: 2. Nationalist leaders from Scotland, Wales, and Northern Ireland have formalized a collaborative effort to advocate for self-determination through the Cardiff Agreement. Signed by representatives from the SNP, Plaid Cymru, Sinn Féin, and the Northern Ireland government, the memorandum outlines shared objectives such as potential accession to the European Union, renewable energy investment, and economic growth. While the initial agreement served as a tool for political pressure against Westminster without immediately triggering a formal break, the movement has intensified. Leaders have since called for constitutional reform and urged the United Kingdom government to prepare for potential referendums. Scottish First Minister John Swinney characterized the dynamics for reform as ‘undeniable,’ noting that Westminster must prepare for a post-breakup future. Analysts have cautioned that these secessionist movements could impact the United Kingdom’s international standing and European security architecture. ## Timeline ### 2026-09-27: Celtic leaders sign memorandum seeking independence from UK Leaders from Scotland, Wales, and Northern Ireland signed a memorandum in Cardiff asserting their right to independence and calling for constitutional reform within the United Kingdom. 2 sources. https://clstr.news/cluster/celtic-leaders-sign-memorandum-seeking-independence-from-uk ### 2026-09-19: Nationalist leaders sign Cardiff Agreement for self-determination Nationalist leaders from Scotland, Ireland, and Wales signed the Cardiff Agreement to advocate for self-determination and cooperation on goals like EU membership and renewable energy. 7 sources. https://clstr.news/cluster/nationalist-leaders-sign-cardiff-agreement-for-self-determination --- Cite as: Celtic nations independence movement. CLSTR, https://clstr.news/situations/celtic-nations-independence-movement