BEIJING, Oct. 6 (Xinhua) -- Yang Jiechi, director of the Office of the Foreign Affairs Commission of the Communist Party of China (CPC) Central Committee, on Saturday went to the Vietnamese embassy in Beijing to mourn the passing away of Vietnam's former top party leader Do Muoi.

Yang, also a member of the Political Bureau of the CPC Central Committee, signed the condolence book.

He said comrade Do Muoi was an outstanding party and state leader of Vietnam, who made important contributions to the normalization and development of relations between the two countries.

The Vietnamese side expressed sincere appreciation to Yang for visiting the embassy to mourn.

Do Muoi, former general secretary of the Communist Party of Vietnam Central Committee, passed away on Monday at the age of 101.