In 2019, one of the most important events in the field of China-related international commercial arbitration was the signing on April 2 and entry into force on October 1 of the Arrangement of the Supreme People's Court of the People's Republic of China Concerning Mutual Assistance in Court-ordered Interim Measures in Aid of Arbitral Proceedings by the Courts of the Mainland and of the Hong Kong Special Administrative Region (the "Arrangement"). Supplementary to the Arrangement, the Research Office of the Supreme People's Court promulgated the Understanding and Application of the Arrangement of the Supreme People's Court Concerning Mutual Assistance in Court-ordered Interim Measures in Aid of Arbitral Proceedings by the Courts of the Mainland and of the Hong Kong Special Administrative Region (the "Understanding and Application").