A Taiwanese minister has made a rare visit to a Taiwan-controlled islet in the South China Sea to observe a coast guard exercise, as tensions flare in the region. Ocean Affairs Minister Kuan Bi-ling witnessed the humanitarian rescue and medical evacuation drills on Itu Aba, which is also claimed by China, Vietnam and the Philippines . China also claims self-ruled Taiwan as part of its territory, even though Taiwan sees itself as distinct. Kuan's visit to Itu Aba comes as US and Filipino forces