Xi said that they should focus on problems related to carrying capacity of the resources and the environment, disaster risk as well as green development on the plateau, according to the letter.
Xi Jinping, general secretary of the Communist Party of China Central Committee, said in a speech to the Fifth Plenary Session of the 19th Central Committee of the CPC in October that it was "completely possible" for China to become a high-income country by the end of the 14th Five-Year Plan (2021-25).
Wu said the recent move has "poisoned the Sino-US military relationship and seriously damaged cross-Straits relations and peace and security in the region." He called the move "a complete mistake and very dangerous".
Xi said they have reached a series of important agreements on promoting the relations between the two countries and parties since last year.
Xi'an Aerospace Propulsion Institute in Shaanxi province, a key rocket engine research arm of the State-owned space giant China Aerospace Science and Technology Corp, admitted to exaggerating facts about a former employee who has allegedly joined a private rocket company.
Xi highlighted the importance of ensuring economic growth, advancing reforms, readjusting the economic structure, improving people's well-being as well as forestalling risks, saying continuous efforts are needed to win the three critical battles against potential risk, poverty and pollution.
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Xi said he believes that under Pena Nieto's leadership, the Mexican people will overcome the disaster and rebuild their homes.
Wuhan has been the Chinese city hardest hit by the outbreak. As of the end of Tuesday, it had reported more than 50,000 confirmed cases, accounting for more than 60 percent of all cases on the Chinese mainland. But the number of new cases in the city fell to single digits in mid-March and has remained at zero or single digits since.
Xi stressed that non-Communist parties and the united front have made significant contributions to the establishment and the development of China's constitutional system.
XINING - Vice-Premier Zhang Gaoli has underlined the importance of environmental protection in northwest China's Qinghai Province.