The Russians continue to treat the supply of energy as another weapon in their armoury.

俄国人继续把能源供应当成他们军械库中的一个武器。

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As for using energy as a weapon, this week's Ukrainian affair is a reminder of an old lesson: that sellers depend on buyers just as much as buyers on sellers.

至于将能源作为一种武器的人，本周的乌克兰事件提醒他们记住一句老话：卖方对买方的依赖程度实际上和买方对卖方的依赖程度是对等的。

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The letter said the plant would not enrich uranium beyond the 5% level suitable for civilian energy production. That would be substantially below the threshold of 90% or more needed for a weapon.

信中说，该工厂只生产适合于民用能源项目的浓缩铀，纯度将不会超过5%的水平，这将大大低于制造武器所需的90%或以上水平的门槛。

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It weighed about 10 tonnes when it entered the Earth's atmosphere and broke apart 30-50km (20-30 miles) above ground, according to Russia's Academy of Sciences, releasing several kilotons of energy - the equivalent of a small atomic weapon.

BBC: Russia sends clean-up team to meteorite-hit Urals

As for using energy as a weapon, this week's Ukrainian affair is a reminder of an old lesson: that sellers depend on buyers just as much as buyers on sellers.

ECONOMIST: Energy security

When operational, the weapon will fire projectiles at ranges in excess of 200 nautical miles (230 miles) and inflict damage through kinetic energy.

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