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Britain and Israel will "work night and day" in the foreign ministers of the two countries wrote in a joint article.

"The clock is ticking, which heightens the need for close cooperation with our partners and friends to thwart Tehran's ambitions," the UK's Liz Truss and wrote in the Telegraph newspaper on Sunday.

said earlier in the day that his country was "very worried" world powers will remove sanctions on Iran in exchange for insufficient caps on its nuclear programme, as negotiators convene in Vienna on Monday in a last-ditch effort to salvage a nuclear deal.

Meanwhile, Israel and will sign a 10-year agreement on Monday to work closely on areas such as technology, trade and defence, according to the Telegraph.

The foreign ministers added in the article that Israel will officially become Britain's "tier one" in a bid to improve its cyber defences as countries around the world face increased threats.