The declaration of independence and subsequent Constitution granted these bodies the powers assigned to them by the Ahtisaari Plan. Since the Plan was not voted on by the UN Security Council, the ICO's legal status within Kosovo was dependent on the de facto situation and Kosovo legislation; it was supervised by an International Steering Group (ISG) composed of the main states which recognised Kosovo. It was never recognised by Serbia or other non-recognising states. EULEX was also initially opposed by Serbia, but its mandate and powers were accepted in late 2008 by Serbia and the UN Security Council as operating under the umbrella of the continuing UNMIK mandate, in a status-neutral way, but with its own operational independence. The ICO's existence terminated on 10 September 2012, after the ISG had determined that Kosovo had substantially fulfilled its obligations under the Ahtisaari Plan. EULEX continues its existence under both Kosovo and international law; in 2012 the Kosovo president formally requested a continuation of its mandate until 2014. Its mandate was further extended in 2016, 2018, and 2020 and its current mandate expires in June 2021. Since 2018, the mandate of EULEX has been greatly reduced and it now only has a monitoring role.