Pakistan, May 22 -- President Asif Ali Zardari on Wednesday extended heartfelt congratulations to the governments and peoples of Pakistan and China on the occasion of the 74th anniversary of the establishment of diplomatic relations between the two countries. He said that Pakistan highly valued its historic and time-tested relationship with China, adding that ties with China remained a cornerstone of Pakistan's foreign policy. The President remarked that over the past seven decades, bilateral relations between the two brotherly nations had grown from strength to strength, evolving into a comprehensive strategic cooperative partnership. He described Pakistan and China as "iron brothers" bound by an all-weather friendship. "Pakistan is a st...