Febuary 2011: "Several small demonstrations are held in Syria to call. Syrian security forces are able to contain the demonstrations, making a number of arrests." (Britannica)
March 29- April 12, 2011: "The government begins to use heavy military weapons against hubs of protest. As protests spread and the number of protesters reported killed rises." (Britannica)
August 3, 2011: "The UN Security Council condemns the Syrian government for its use of violence against protesters." (Britannica)
April 19, 2012: "As violence escalates, Ban Ki-moon, the secretary-general of the United Nations, states that Syria has failed to adhere to the terms of the UN peace plan and that both government and opposition forces have been responsible for breaching the cease-fire." (Britannica)
June 23, 2014: "The last of the Syrian government’s declared stockpile of chemical weapons are removed from the country under the terms of the U.S.-Russian agreement from September 2013." (Britannica)
Later in September 30, 2015: "Russia carries out its first airstrikes in Syria." (Britannica)
October 9, 2019: "Turkey launches an offensive into the Kurdish region of northeastern Syria, days after the United States says it would not fight such an incursion." (Britannica)