If Russia and Ukraine had wanted to find a way to encourage the EU to diversify away from Russian gas, they could hardly have come up with a better one.

• 如果俄罗斯和乌克兰是想让欧盟实现能源多样化以降低对俄罗斯天然气依赖的话，那还真难有比切断天然气供应更好的方式。