Japan’s sharp reduction in funding for a leading international body fighting infectious diseases risks damaging Tokyo’s credibility and long-held “peace diplomacy”, in a move analysts say could give China an opening to expand its influence across developing nations. The Switzerland-based Global Fund to Fight Aids, Tuberculosis and Malaria, established in 2002, has saved an estimated 70 million lives in more than 100 countries by boosting testing capacity, surveillance systems, community networks...