In this file photo taken on May 28, 2018, Police officers from China and Italy attend a ceremony held to symbolically mark the start of the third year of law enforcement cooperation between the two countries in Rome, Italy. In 2014, China and Italy agreed to launch the joint patrol program during peak travel seasons. Since May 2016, China has sent three groups of police officers to patrol streets in Italy. Italian officers were first invited to the joint patrol in Beijing and Shanghai in April 2017. (Xinhua/Alberto Lingria)