The Kurdish Supreme Committee was dissolved in 2013, when the PYD abandoned the alliance with the KNC and established the Movement for a Democratic Society (TEV-DEM) coalition with other political parties. On 19 July 2013, the PYD announced that it had written a constitution for an "autonomous Syrian Kurdish region", and planned to hold referendum to approve the constitution in October 2013. Qamishli served as first "de facto" capital of the PYD-led governing body, which was official called the "Interim Transitional Administration". The announcement was widely denounced by both moderate as well as Islamist factions of the Syrian opposition. In January 2014, three areas under TEV-DEM rule declared their autonomy as cantons (now Afrin Region, Jazira Region and Euphrates Region) and an interim constitution was approved. The Syrian opposition and even the Kurdish parties belonging to the KNC condemned this move, regarding the canton system as illegal, authoritarian, and supportive of the Syrian government. The PYD countered that the constitution was open to review and amendment, and that the KNC had been consulted on its drafting beforehand. From September 2014 to spring 2015, the YPG forces in Kobanî Canton, supported by some Free Syrian Army militias and leftist international and Kurdistan Workers' Party (PKK) volunteers, fought and finally repelled an assault by the Islamic State of Iraq and the Levant (ISIL) during the Siege of Kobanî, and in the YPG's Tell Abyad offensive of summer of 2015, the regions of Jazira and Kobanî were connected.