that brought him to power, Hun Sen cultivated close ties with China, which opposed efforts by Western countries to impose economic sanctions on Cambodia. China's close ties with Cambodia have also served to gain leverage against Vietnamese influence in the region. In June 2020, Cambodia was one of 53 countries that backed the Hong Kong national security law at the United Nations. Chinese assistance During the visit of Chinese Premier Wen Jiabao between April 7-April 8, 2006 both nations signed several bilateral agreements and a treaty of "Comprehensive Partnership of Cooperation." China diversified its aid and investments in Cambodia and promised to provide US$600 million in loans and grants. China has canceled much of Cambodia's debt and granted a fresh loan of US$12.4 million for the construction of the building housing the Cambodian government's council of ministers and the restoration of the Angkor Wat temple and heritage site. About $200 million has been earmarked as a low-interest loan for the construction of bridges spanning the Mekong and Tonle Sap rivers. China has cultivated strong ties with Cambodia, gaining access to its sea ports that can allow China to exploit oil reserves in the Gulf of Tonkin. During the visit, Cambodian Prime Minister Hun Sen described China as Cambodia's "most trustworthy friend." China has also cultivated military ties. In the aftermath of the 1997 coup, China provided US$2.8 million in military aid and has since supplied wide range of military equipment, training of military and police cadre and naval vessels to combat drug trafficking and piracy. China has also funded Chinese language schools in Cambodia. Immigration of Chinese workers to Cambodia has also stepped up in recent years and is estimated between 50,000 and 300,000. Commerce Trade between Cambodia and China totaled US$4.8 billion in 2016, compared to $732 million in 2006 and has increased by an average of 26% for the last 10 years. However, Cambodia has a significant trade deficit with China, importing over $3.9 billion (raw fabrics being the largest constituent) compared to its exports of $830 million. It was estimated that 60% of products in Cambodian markets are Chinese-made on 2006, and 24% of Cambodian imports were from China in 2015. There are multiple large-scale Chinese investment projects in Cambodia such as the 400 MW Lower Se San 2 Dam worth $781 million and a US$3.8 billion deepwater port project on a 90-km stretch of Cambodian coastline.