China was opening its doors to the global Internet, some media outlets optimistically declared, while others said Beijing was defending its system of censorship and state control.
Cyber sovereignty is the idea that states should be permitted to manage and contain their own internet without external interference.
In his letter, Xi said the development of the internet has posed many new challenges for the sovereignty, security, and development interests of the world's countries.
"The development of China's cyberspace is entering a fast lane.China's doors will only become more and more open", said Xi in the note.
China's Communist Party has been implementing stringent cyber regulations over the past year.
China adopted a new cybersecurity measure this year requiring foreign firms to store data in the country and submit to surveillance checks.
China has advocated strongly for a larger role in global internet governance under Xi.
Chinese regulators opine that new laws and tightened regulations align with worldwide rules and implemented with an objective to protect personal privacy and counter attacks on the infrastructure. Business groups say the rules unfairly target foreign firms.
Tim Cook, the chief executive of Apple, said: "Developing a digital economy for openness and shared benefits is a vision we at Apple share".
China's defense for its new policies would influence the global internet governance. The Cyberspace Administration of China said the new measures, which include increased surveillance of messaging apps and tighter controls on the use of virtual private networks, were created to maintain social order and protect socialist values.
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