Foreign ministers of four Southeast Asian countries are visiting China this week. The first of the meetings took place Wednesday between Chinese State Councilor and Foreign Minister Wang Yi and his Singaporean counterpart Vivian Balakrishnan in Nanping City, Fujian Province. The meeting came as the two sides marked the 30th anniversary of the establishment of diplomatic relations. Wang Yi said China supports ASEAN to uphold the principles of non-interference in internal affairs.