 Complete the following phrase:  On 14 April 2018, French President Emmanuel Macron said in a statement that Frances red line has been crossed, in reference to the previous attacks on Douma. Beginning at 04:00 Syrian time UTC3, France, the United States, and the United Kingdom carried out a series of military strikes involving aircraft and ship-based missiles against multiple government sites in Syria. They said it was in response to the Douma chemical attack against civilians on 7 April, which they attributed to the Syrian government. The Syrian government denied involvement in the Douma attacks and called the airstrikes a violation of international law. On 20 April, the Syrian government returned the Légion dhonneur award that was given to President Bashar al-Assad by France in 2001, stating that he would not wear the award of a slave country to the US. Following the 