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Xi said in the letter that the China-Russia comprehensive strategic partnership of coordination has been showing a strong momentum and constant advances in all fields. In recent years, substantial achievements have been scored in bilateral energy cooperation, which has played an active role in facilitating both countries' economic and social development.

Highlighting the special friendship between China and Cuba, Wei recalled the high-level bilateral ties in recent years and the substantial development of military relations between the two countries.

In April, Xi told visiting UN Secretary-General Antonio Guterres that "everything we do is for people's happiness and national rejuvenation and to seek common ground for the world."

With the aims to expand its petroleum products sales in southeastern Asia and to seek new routes to market, the PetroChina company with its Lao partner undertook thorough researches in demands, market access, custom clearance and transportation, etc.

"China welcomes and encourages fair competition among them, and will fully protect their legitimate rights and interests," Xi said.