Turkey's offensive in Syria: a timeline

Turkey's army launched a major air and ground operation in northern Syria over the weekend in a bid to oust a US-allied Kurdish militia that it considers a terror group.The offensive follows an announcement by a US-led coalition fighting the Islamic State group that it is working to create a 30,000-strong border security force in northern Syria.Around half of that force would be retrained fighters from the US-backed Syrian Democratic Forces, which is mainly made up of fighters from Kurdish milit