- Public International Law
Legal and Strategic Implications of the UK–Mauritius Agreement on the Chagos Archipelago
On 22 May 2025, the governments of the UK and Mauritius signed a landmark agreement concerning the sovereignty and future governance of the Chagos Archipelago (“UK-Mauritius Agreement” or “Agreement”). The UK has administered the Chagos Archipelago as part of the British Indian Ocean Territory (“BIOT”) since 1965. This includes Diego Garcia, the largest island in the archipelago, which hosts a military base located in a strategically important area of the Indian Ocean that is jointly operated by the UK and the U.S. (see the map on the next page). In the UK-Mauritius Agreement, the UK and Mauritius agree that Mauritius has sovereignty over the entire Chagos Archipelago, including Diego Garcia. The UK will lease Diego Garcia for 99 years, with an option to...To read the full article, please see the PDF file
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Shimpei Ishido has been active in the field of international trade matters and international investment disputes for many years. He advises and represents governments and major corporations with regard to investment arbitration under ICSID, ICC, and UNCITRAL arbitration rules. He currently serves as a member of the Japanese delegation to UNCITRAL Working Group III (Investor–State Dispute Settlement Reform). He also advises the government and corporations regarding anti-dumping and countervailing measures and WTO dispute settlements proceedings concerning such trade remedy measures.
In addition, he usually provides his clients with general advice on a variety of international law issues, including investment protection, economic sanctions, government procurement, trade in services, e-commerce, sovereign and diplomatic immunities, law of the sea, and space law. His client engagement in these fields of international law includes:
i) capacity-building training on international investment law and trade in services to government officials of various states in the Asia-Pacific Region and Central Asia;
ii) advice on government procurement procedures covered by GPA and FTA/EPAs;
iii) advice on sovereign or diplomatic immunities issues concerning contracts between a foreign government/international organisation and a private entity;
iv) advice on international law issues arising from private entities' exploration of space resources on the Moon and other celestial bodies.
Before joining Nishimura & Asahi, he led, as legal counsel to the Ministry of Foreign Affairs of Japan, the negotiation of Japan’s international investment agreements, including the investment and trade in services chapters of the Trans-Pacific Partnership, the Japan–EU EPA, the ASEAN–Japan Comprehensive Economic Partnership, the Japan–Australia EPA, the Japan-Mongolia EPA, and the Japan–Mozambique BIT.
He received an LLM in international law from University College London.