Upholding a graduation thesis is the dream and also the target which every final year student has strived for during 4 years at the university. I myself find lucky and honorable to be one of the 15 students in the list for graduation thesis of the International Law Faculty. Just only one month and a half for searching and working on the thesis is quite a hard time for me but I am now happy enough with what I’ve done. From the bottom of my heart, I would like to express my sincere gratitude to those who gave me supports and encouragement to complete this thesis.

First, I am deeply indebted to my supervisor Mr. Dang Tran Nam Trung and my Professor Doan Dung who helped me a lot with valuable suggestions, precise guidance and useful materials. I am very lucky to be under the supervision of such enthusiastic and devoted people.

The second thank I want to give to all Professors in the International Law Faculty_ Diplomatic Academy of Vietnam. You have inspired my interest in International Law and made me strongly believe in the choice for law major.

I also would like to give special thanks to my English teacher Doan Van Thang who looked closely at the final version of the thesis for English style and grammar correction.

The last thank I want to save for my family and my dear friends who are always by my side whenever I have difficulties, and whose love, sympathy and encouragement have increased my strength to overcome obstacles and complete the thesis successfully.