"Yellow Vests" protesters gather at the Opera Square in Paris, France, on Dec. 15, 2018. French government planned tough security measures by mobilizing thousands of officers and using armored vehicles to handle more threats of violence as "Yellow Vests" are set to stage a fresh round of nationwide protests on Saturday, despite President Emmanuel Macron's measures seeking to quell public anger over poor revenue and soaring living costs. (Xinhua/Chen Yichen)