Rishi Sunak and his wife Akshata Murty have been greeted off the plane in Tokyo by British ambassador to Japan Julia Longbottom.
Visiting Tokyo, the Prime Minister will commit to deploying a naval battle fleet in the Indo-Pacific in 2025 and to double UK troop numbers in upcoming joint exercises.
He will agree to launch a partnership on semiconductors in order to reduce the reliance on Beijing for the supply of the essential microchips before attending the G7 summit.
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