The training of an armed force by the United States in Syria will raise tensions in the region, and may cause another round of military reactions by Russia, experts said.
The uncertainty resulting from the US-China trade disputes "is causing longer-term damage," she added.
The trips will kick off simultaneously in Hunan and Shaanxi provinces on June 28, with participants first driving to Beijing for an opening ceremony on July 1.
The two presidents also talked about the situation in Syria. Xi said any use of chemical weapons is unacceptable and that the path of political settlement should be followed.
The trend is a worrying sign of things to come should social distancing practices such as working from home become the norm, experts said, as isolated individuals have even fewer mechanisms such as peer support to check addictive behavior.
The two countries have already slapped tariffs on billions of dollars worth of each other's goods.
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The trial has taken almost a year. The case also involves an 11th person identified as acting along with the other 10, but whom police were unable to detain.
The two police community relations officers had long maintained close communications with Lau. Lau is "certainly acquainted with the injured officers", noted Ng.
The two prime ministers are in China to attend the Summer Davos Forum, scheduled in Dalian, Liaoning province, through Wednesday.
The two workers' tests will be sent to the US Centers for Disease Control and Prevention (CDC) for confirmation.