170 P M Thu / VNU Journal of Foreign Studies, Vol 36, No 4 (2020) 170 181 LEVELS OF ANALYSIS FROM THEORY TO PRACTICE CASE STUDY U S POLICY IN THE EAST SEA UNDER THE TRUMP ADMINISTRATION Pham Minh Thu* Diplomatic Academy of Viet Nam, Americas Department, Ministry of Foreign Affairs 69 Chua Lang, Dong Da, Hanoi, Vietnam Received 02 March 2020 Revised 15 May 2020; Accepted 27 May 2020 Abstract Three levels of analysis (individuals, nation states and international system) which have been widely reco[.]