ICYMI: Russia's interests in the North Pole

Russia's aircraft carrier may be creaky, but its submarines are among the best in the business and they ply the currents beneath the Arctic at will - though not unchallenged. So, who's challenging Russia and what are the world's powers fighting over in the warming waters? (This is a rebroadcast of "The next Great Game may be played for the North Pole" from December 2016).

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