Table Of ContentJoemrith, Khanpoj (2015) Enforcing arbitral awards against sovereign states : The 
validity of sovereign immunity defence in investor -state arbitration. PhD Thesis. SOAS, 
University of London 
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ENFORCING ARBITRAL AWARDS  
AGAINST SOVEREIGN STATES 
 
 
THE VALIDITY OF SOVEREIGN IMMUNITY DEFENCE  
IN INVESTOR-STATE ARBITRATION 
 
 
 
 
KHANAPOJ  JOEMRITH 
 
 
Thesis submitted for the degree of PhD in Law 
 
2015 
 
 
 
School of Law, Faculty of Law and Social Sciences, 
School of Oriental and African Studies (SOAS), University of London.
Enforcing Arbitral Awards Against Sovereign States 
Declaration for SOAS PhD thesis 
 
I have read and understood regulation 17.9 of the Regulations for students of the SOAS, 
University of London concerning plagiarism. I undertake that all the material presented 
for examination is my own work and has not been written for me, in whole or in part, by 
any other person. I also undertake that any quotation or paraphrase from the published or 
unpublished work of another person has been duly acknowledged in the work which I 
present for examination. 
 
 
Signed: ____________________________    Date: _________________ 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Khanapoj Joemrith    2
Enforcing Arbitral Awards Against Sovereign States 
Thesis Abstract 
 
 
This thesis concerns the inter-relationship between international investment law and the 
law  of  sovereign  immunity  focusing  on  the  enforcement  of  arbitral  awards  against 
sovereign  states.  The  core  hypothesis  is  that  investor-state  arbitration  is  severely 
hampered  in  its  role  of  providing  a  remedy  to  foreign  investors  for  losses  to  their 
investments caused by the breaches of International Investment Agreements by host 
states. In particular, there exists the risk that an arbitral award against the respondent state 
can be undermined by the respondent state’s use of the sovereign immunity doctrine 
against execution as a defence against the payment of compensation.  
 
Accordingly, this leads to the main research question: Whether the defence of sovereign 
immunity doctrine should be fully available to a state in order to refuse the enforcement 
of  arbitral  awards,  or  should  it  be  subject  to  limitations  specified  in  the  municipal 
sovereign immunity law of the country, in which the enforcement is sought? The major 
problem of investor-state arbitration is the extent to which the consent of a state to waive 
its immunity from enforcement and execution in both arbitration clauses and municipal 
sovereign immunity laws actually exists in any given case. 
 
The thesis argues that international investment law is a hybrid law displaying both private 
and public law characteristics. This can influence the development of rules concerning 
immunity from execution. Accordingly, the balancing of state obligations and investor 
rights under a proportionality analysis could be considered as an effective tool to promote 
the investment and to protect the interests for both investors and host countries towards a 
fair and impartial forum, where such immunity is in issue. Lastly, this attempt could not 
be effective without the development of international conventions and municipal laws on 
sovereign  immunity  in  parallel  to  secure  the  execution  of  arbitral  awards  before  a 
municipal court as well as to support the applicability of international conventions. Thus, 
this would limit the excessive or unjustified claims of sovereign immunity as a defense 
against the enforcement of arbitral awards in which state responsibility could not be 
avoided for a breach of investment treaty obligations towards private investors. 
Khanapoj Joemrith    3
Enforcing Arbitral Awards Against Sovereign States 
Acknowledgments 
 
 
 
Firstly, I would like to express my gratitude to my supervisor, Professor Peter Muchlinski 
for his kind support in providing me a useful guidance and comment on my thesis as well 
as a moral support to encourage me to overcome the difficulties over four years of my 
PhD study, even during his health concern. It has been my great pleasure to work with 
him, as he is one of the leading scholars in this area of my study. This thesis would not 
have been possible without him. 
 
Also, I would like to thank my second supervisor, Dr.Emilia Onyema, for supervising and 
giving me a valuable comment on my thesis, especially in a commercial arbitration 
aspect. I would like to convey my gratitude to Professor Dr. Sompong Sucharitkul, who 
shares his experiences and practical considerations in this field. In addition, my PhD 
thesis may not be successful without the help and assistance from the staffs and the 
librarians of SOAS, Institute of Advance Legal Studies and London School of Economics 
and Political Science. 
 
Lastly, I am also grateful to all my family and friends for their unconditional loves and 
considerable supports everyday and night during my time in London. 
 
This thesis is dedicated to JOEMRITH family. 
 
Khanapoj Joemrith 
London, United Kingdom 
 
April 2015
 
 
 
Khanapoj Joemrith    4
Enforcing Arbitral Awards Against Sovereign States 
Table of Contents 
 
 
Abstract                    3 
Acknowledgements                  4 
Table of Cases                  9 
Table of Legislations and other Materials           17 
   
PART I INTRODUCTION 
Chapter 1 : Introduction                  
1. Brief synopsis                20 
2. Structure                   28 
3. Methodological Framework             29 
(a) Doctrinal Issues              30 
(b) Legislative Practice            31 
(c) Judicial Decisions and Arbitral Awards        35 
4. Concluding Remarks              39 
 
PART II THEORETICAL FRAMEWORK  
Chapter 2 : International Investment Law as  
                    a Regime of Public International Law and its related Doctrines    
1. Introduction                 42 
2. International Investment Law as a Regime of Public International Law  43 
3. The Fragmentation or Defragmentation of International Law    53 
4. Doctrines relating to Investor-State Dispute Settlement       57 
(a) The Doctrine of Treaty Interpretation         57 
    (b) The Doctrine of State Responsibility         64 
  5. Concluding Remarks              72 
 
 
 
 
 
Khanapoj Joemrith    5
Enforcing Arbitral Awards Against Sovereign States 
Chapter 3 : The Progressive Restriction of Sovereign Immunity Law   
                     and its Relevance to Investment Treaty Arbitration        
1. Introduction                 74 
2. The Evolution of Restrictive Sovereign Immunity       79 
  (a) Foundations of Modern Sovereign Immunity Doctrine    79 
  (b) The Effect of State Trading          82 
  (c) The Shift to Restrictive Immunity         86 
3. The Commercial Activity Exception  
    and its Relevance to Investment Treaty Arbitration      91 
    (a) Immunity from jurisdiction          93 
    (b) Immunity from enforcement and execution       99 
  4. Concluding Remarks              111 
 
PART III THE ENFORCEMENT AND EXECUTION OF ARBITRAL AWARDS 
Chapter 4 : International Conventions on the Enforcement  
                     and Execution of Arbitral Awards in Municipal Courts Jurisdictions   
1. Introduction                 114  
2. The ICSID Convention              117 
  (a) Background              117 
  (b) The Enforcement of ICSID Arbitral Awards      119 
3. The New York Convention             126 
(a) Background              126 
(b) The Enforcement of the New York Convention Awards   127 
4. The Main Distinction between the ICSID and New York Convention    
     on the Enforcement of Arbitral Awards           129 
(a) The Applicable Law  
Goverining the Enforcement of Arbitral Awards     132 
(b) The Finality and the Review of Aribitral Bwards  
in Domestic Courts            139 
(c) The Claim of “Public Policy”           148 
(d) Conclusion: A Value of Arbitral Awards        151 
      and its Alternative to Enforcement  
Khanapoj Joemrith    6
Enforcing Arbitral Awards Against Sovereign States 
 
  5. Concluding Remarks              154 
 
Chapter 5 : The Impact of International Arbitration Conventions  
         on an Agreement to Arbitrate before Municipal Courts  
  1. Introduction                 156 
2. Immunity from Jurisdiction             158 
3. Immunity from Enforcement and Execution         170 
4. The Impact of International Arbitration Conventions       179 
    (a) The ICSID Convention             180 
    (b) The New York Convention           185 
    (c) Institutional Arbitration Rules           192  
5.Concluding Remarks              203 
 
PART IV CHALLENGES AND LIMITATIONS 
Chapter 6 : Challenges and Limitations to  
                     Enforcing Arbitral Awards Against Foreign States        
  1. Introduction                 206 
2. Execution against Mixed Purposes  
    and Specially Protect Foreign State Properties         209 
(a) Bank Accounts Held by Diplomatic Missions  
in The Executing Country           209 
    (b) Central Bank Funds            227 
    (c) Specially Protected Property          233 
    (d) Concluding Remarks            235 
3. The Nexus Requirement                236 
4. Concluding Remarks               244 
 
PART V CONCLUSIONS 
Chapter 7 : Practical Considerations and A Way Forward         
  1. Introduction                 247 
2. Practical Considerations               251 
Khanapoj Joemrith    7
Enforcing Arbitral Awards Against Sovereign States 
(a) Amendment to International Conventions  
     and Investment Treaties to include an Express Waiver  
     of Sovereign Immunity from Execution         253 
(b) Development in the Interpretation of Municipal Law  
                             on Sovereign Immunity             262 
3. A Way Forward : Reform and the use of Proportionality?     265 
4. Concluding Remarks              281 
 
Chapter 8 : Concluding Remarks               283 
 
Bibliography                 292 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
Khanapoj Joemrith    8
Enforcing Arbitral Awards Against Sovereign States 
Table of Cases 
 
 
 
AD HOC ARBITRATIONS 
British Petroleum Exploration Co. v Libyan Arab Republic (1973) 53 ILR 297 
 
Saudi Arabia v Arabian American Oil Co. (ARAMCO) [1958] 27 ILR 117 
 
 
EUROPEAN COURT OF HUMAN RIGHTS 
Al-Adsani v United Kingdom, ECtHR Application no. 35763/97, Judgment, 21 November 
2001 
 
Cudak v Lithuania, ECtHR Application no.15869/02, Judgment, 23 March 2010 
 
Fayed v United Kingdom, Judgment, ECtHR Application no. 17101/90, Judgment, 21 
September 1990 
 
Forgarty v United Kingdom, ECtHR Application no. 37112/97, Judgment, 21 November 
2001 
 
Golder v United Kingdom, ECtHR Application no. 4451/70,  Judgment, 21 February 
1975 
 
Hornsby v Greece, ECtHR Application no. 18357/91, Judgment, 19 March 1997 
 
James and others v the United Kingdom, ECtHR Application no. 8793/79, Judgment, 21 
February 1986 
 
Lithgow and Others v. United Kingdom, ECtHR Application no.9006/80; 9262/81; 
9263/81; 9265/81; 9266/81; 9313/81; 9405/81, Judgment, 8 July 1986 
 
McElhinney v Ireland, Judgment, ECtHR Application no. 31253/96, Judgment, 21 
November 2001 
 
Waite and Kennedy v Germany [GC], ECtHR Application no. 26083/94, Judgment, 18 
February 1999 
 
Sporrong & Lonnroth v. Sweden, ECtHR Application no. 7151/75; 7152/75, Judgment, 
23 September 1982. 
 
 
FRANCE 
Bevenuti & Bonfant v. Congo, Judgment of December 23, 1980, Tribunal de Grande 
Instance de Paris; See also 108 Journal Du Droit International 843 (1981). 
Khanapoj Joemrith    9
Description:thesis title", name of the School or Department, PhD Thesis, pagination.  In addition, my PhD thesis  and Execution of Arbitral Awards in Municipal Courts Jurisdictions  (b) Development in the Interpretation of Municipal Law  Instance de Paris; See also 108 Journal Du Droit International 843 (1981)