On 1 January 2024, Foreign State Immunity Law of The People’s Republic of China (“FSIL”) came into effect, changing and clarifying the position of sovereign immunity under the laws of Hong Kong and mainland China.
Before the FSIL, the sovereign immunity position under the laws of China was that a state and its property enjoyed

One of the key challenges in the course of an international arbitration with a Mainland China based counterparty is the enforcement of interim measures granted by the tribunal. As a general rule, a Mainland court will not grant any interim relief or provide any assistance to parties to an arbitration outside of Mainland China. This was an issue in Hong Kong until the Arrangement Concerning Mutual Assistance in Court-ordered Interim Measures in Aid of Arbitral Proceedings by the Courts of the Mainland and the Hong Kong Special Administrative Region came into force on 1 October 2019 and enabled recognized institutional arbitration institutions in Hong Kong to apply for relief in Mainland China and vice versa.
Post Achmea and Komstroy, arbitration provisions in bilateral investment treaties have come into doubt with respect to intra-EU disputes between investors and EU member states. Most recently, the Contracting Parties to the Energy Charter Treaty (ECT) on June 24, 2022, announced their agreement in principle on the modernisation of the ECT.
The Supreme Court on May 23, 2022, in its decision in Morgan v. Sundance, Inc., rejected the “arbitration specific waiver rule demanding a showing of prejudice” to the party opposing the petition to enforce the arbitration agreement. That rule had been followed for decades by nine Circuits.