LONDON — Japan has given the UK just six weeks to strike a post-Brexit deal, putting Boris Johnson’s government under pressure to agree one of the fastest trade negotiations in history, the Financial Times reported.

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“To avoid a gap in January, we must pass this in the autumn session of the Diet (the Japanese parliament),” Hiroshi Matsuura, Tokyo’s chief negotiator, told the Financial Times. “That means we must complete negotiations by the end of July.”