FOR YEARS, western European countries have worried about their access to gas, almost two-fifths of which is supplied by Russian pipes. These fears have not receded since in 2014 Russia cut off gas to Ukraine, the main thoroughfare through which its gas arrives in EU countries. Three times since 2006, rows with Russia have stopped gas flowing through Ukrainian pipelines, leaving customers down the line shivering, EU leaders have long pondered other sources, such as American LNG, but the latter is far more expensive.
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