(FILE PHOTO) Metro Manila (CNN Philippines, June 9)— The leaders of the Philippines and China vowed to promote "win-win" cooperation as the countries commemorated the 46th anniversary of their diplomatic relations on Wednesday. "Win-win cooperation will ensure that our relations remain a partnership for greater peace, progress, and prosperity," President Rodrigo Duterte said in a taped message aired during an event led by the Federation of Filipino-Chinese Chambers of Commerce and Industry Incorporated. Chinese President Xi Jinping, in a letter addressed to Duterte, said Beijing is also ready to work with Manila to strengthen bilateral ties. "I attach great significance to the development of China-Philippines relations, and stand ready to work with you in guiding our bilateral relations to move forward in a sustained and steady manner, so as to achieve greater win-win results and mutual benefits," Xi wrote, as he hailed the "everlasting friendship" between the two nations.