The visits by Chinese leaders to African, Latin American and some other nations would promote China's friendship and cooperation with these countries, while Chinese Premier Wen Jiabao's latest European trip has boosted confidence in jointly tackling the global financial crisis. Chinese President Hu Jintao will visit Saudi Arabia, Mali, Senegal, Tanzania and Mauritius from Feb. 10 to Feb. 17. Vice President Xi Jinping left here Sunday morning for official visits to Mexico, Jamaica, Colombia, Venezuela, Brazil and Malta.