Wang Qishan, 69, a close associated of Xi who was in charge of China's anti-corruption drive, was elected as the new Vice President at the annual session of the National People's Congress (NPC).
The military's official People's Liberation Army Daily, reports Reuters, pledged its loyalty to Xi in its editorial, saying his election would ensure the country's long-term peace and stability.
Mr Lee also wrote to Mr Li Keqiang to congratulate him on his re-appointment as the Chinese Premier.
As expected, Mr Xi won unanimous approval at the National People's Congress for his reappointment as China's president, and following changes in the constitution agreed earlier at the parliament, there are no limits on how many terms he can serve.
Mr Lee also congratulated Mr Xi on his reappointment, stating that Mr Xi has "led China to new achievements amidst an uncertain and challenging global environment" under his leadership.
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During the investor day, Ek also revealed the company licensed more than 35 million tracks and employed 3,500 employees. This was disclosed in their public offering filing, which further concretes that the launch in India is quite near.
He said that he looked forward to continue working with Mr Xi to take the countries' "strong bilateral relationship to greater heights".
In his letter to Premier Li, Mr Lee said China's continued development and opening up over the past decades have brought about many benefits to the Chinese people.
On Saturday, Xi made a public oath of allegiance to the Constitution in the Great Hall of the People in Beijing.
President Kenyatta, who is on a State visit to Cuba, said President Xi's re-election has fully demonstrated the strong confidence of the Chinese people in his vision and wisdom in the governance of China and worldwide affairs. Li, 63, a second ranking leader in the ruling Communist Party of China (CPC), has completed the first five-year tenure along with Xi who is now regarded as the "core" leader of the party placed along with party founder Mao Zedong.
With this year marking the 10th anniversary of the establishment of South Korea-China strategic cooperative partnership, Moon said he would like to make efforts with Xi to steer bilateral relations toward maturity and into a new era.