West sees Bulgaria as variously vulnerable

Political instability, relative poverty, Russian energy dependence, corruption and eastern border sum to vulnerability

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Cyber attacks threaten South Korean nuclear safety

A prolonged cyber attack on South Korea's nuclear power operator exposes the sector's vulnerability

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Hitherto united right-wing front is starting to show signs of strain

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Although talks have been extended, space for compromise is narrowing

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Incremental moves are shifting Japan away from a gradual phase-out of nuclear power

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Talks have sustained momentum following last month's extension, but political threats are looming

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'Turkish Stream' pipeline appears to benefit Turkey but could put Russian supplies in dominant position over rivals

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Both the Iranian and the US government will have to manage increasingly critical domestic audiences

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Low gas prices will imperil some alternative energy projects, but long-term trends still favour the industry

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Coal and gas have seen sharp price drops, and face lower demand and production rationalisation

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