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UK and Japan Agree £18 Billion Investment and Frontier Technology Partnership

The package expands cooperation on AI, semiconductors and offshore wind while defence funding and contract details for the Global Combat Air Programme remain unresolved.

Overview

  • The UK and Japan announced a roughly £18 billion package that includes more than £9 billion for infrastructure and financial services and up to £9 billion for offshore wind, with officials saying the deals will support tens of thousands of jobs.
  • The leaders signed a UKJapan Frontier Technology Partnership to speed collaboration on AI, quantum and dual‑use technologies and formally linked the UK Semiconductor Centre with Japan’s Rapidus to create a pathway toward chip manufacturing.
  • Commercial memoranda were publicised, including Rolls‑Royce cooperation with Japan’s Atomic Energy Agency, Eisai’s £48 million UK investment, Hitachi Energy’s grid jobs and commitments to 5.9GW of floating offshore wind projects in Scotland and the Celtic Sea.
  • The two leaders reaffirmed political support for the Global Combat Air Programme but detailed UK funding and the next‑phase international contract remain unclear following Defence Secretary John Healey’s resignation, with partners expected to discuss a contract by the end of June.
  • They issued a JapanUK Joint Declaration on Economic Security that targets supply‑chain resilience and critical minerals and sets new mechanisms for defence industrial cooperation, a development timed to build momentum ahead of the G7 summit.