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It shows both carriers coming close to Japanese islands, and at times sailing through Japan's exclusive economic zone.

The exclusive economic zone is an area beyond a country's territorial waters where that country has exclusive rights to explore and exploit marine resources, but other countries are allowed freedom of navigation through it.

But by the following summer, it was producing its own variant, known as Geran, at a special economic zone in Yelabuga, in the Russian republic of Tatarstan.

That was supposed to make NI an attractive location for manufacturing investment- "the world's most exciting economic zone" the former Prime Minister Rishi Sunak called it.

On 20 February, the first Western tourists started arriving in Rason, a city earmarked by the North as a special economic zone, to trial new financial policies.