Greece entered the First World War in 1917 with the intention of seizing Constantinople (Istanbul) and Smyrna (İzmir) from the Ottomans, with the encouragement of the British and French governments, who also promised the Greek government "enosis" with Cyprus at a certain stage. The ongoing genocide of Pontic Greeks in the Ottoman Empire also played a factor in this decision. Although there was little direct fighting between Greeks and Turks, when the Ottoman Empire collapsed in 1918 the Greeks were quick to claim the lands the Allies had promised them. The 1920 Treaty of Sèvres gave Greece eastern Thrace and an area of about 17,000 km2 in western Anatolia around Smyrna. This Treaty was signed by the Ottoman government but never went into force, not having been ratified by Parliament.