THE NARROW waters separating the Arabian peninsula from the Horn of Africa have never served as much of a moat. Goods and people routinely cross. Iran and the United Arab Emirates (UAE), in particular, are increasingly active in the Horn. Tensions between them rose after the UAE established diplomatic ties with Israel last year, a move that Iran furiously condemned. A string of recent arrests shows how the rivalry between the two is adding volatility to an already unstable region.
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