BBC: How does Europe wean itself off Russian gas?

Each escalation of the crisis in Ukraine sends a jolt of nervousness far beyond its borders as Europe worries about its energy supplies.

With about one-third of Europe's gas coming from Russia and about half of that gas flowing through Ukraine, these are tense times.

Most worried are the four EU member states which get literally all of their gas from Russia - but another 12 rely on Russia for more than half their supply.

Conversations in recent days - mostly off-the-record - with pipeline operators, energy executives and government officials reveal a series of concerns.
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