In late 2012, his government began peace negotiations with the Kurdistan Workers Party (PKK) to end the Kurdish–Turkish conflict (1978–present). The ceasefire broke down in 2015, leading to a renewed escalation in conflict. Erdoğan's foreign policy has been described as Neo-Ottoman and has led to the Turkish involvement in the Syrian Civil War, with its focus on preventing the Syrian Democratic Forces from gaining ground on the Syria–Turkey border during the Syrian Civil War.