PAO TATNEFT v UKRAINE
                                                                    [2021] Lloyd's Rep Plus 1
                                                                    QUEEN’S BENCH DIVISION (COMMERCIAL COURT)
                                                                    Before Sir Andrew Smith, sitting as a Judge of the High Court
                                                                    Arbitration – Enforcement of New York Convention award – Defence based on illegality of submission to arbitration – Whether respondent was estopped from relying upon the defence – Whether the respondent had waived the defence – Arbitration Act 1996, sections 73 and 103(2).