In this file photo taken on July 18, 2018, Chinese and Italian police officers patrol the Bund in Shanghai, east China. 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/Fan Jun)

In this file photo taken on May 2, 2016, Chinese and Italian police officers check the documents of a Chinese tourist group outside the Colosseum 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/Jin Yu)

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)

File photo taken on May 28, 2018 shows a ceremony held to symbolically mark the start of the third year of law enforcement cooperation between China and Italy 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)

In this file photo taken on June 5, 2017, a Chinese police officer talks with an Italian police officer during their joint patrol at Piazza di Spagna of 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/Jin Yu)

In this file photo taken on April 25, 2017, Chinese and Italian police officers talk with an Australian tourist at the Temple of Heaven in Beijing, capital of China. 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/Shen Hong)