Lights over Ukraine: The energy war PHOTO
Every morning, at about 1.30am, NASA's Suomi and NOAA-20 satellites pass over Ukraine.
Their powerful cameras, each weighing as much as a grand piano, capture the pulse of the country - the twinkle of street lights, shop signs and kitchen windows.
High-resolution imagery from the two satellites, shared exclusively with Sky News, shows just how weak that pulse has become.
On 10 October, Russia opened a new front in the war in Ukraine. A front not along any strip of land, air or sea, but in millions of homes across the country.
The strikes that day targeted crucial elements of Ukraine's electricity grid - a strategy which could leave millions without heat or light in the depths of winter.
Since then, in subsequent attacks, every single gas and coal-fired power plant has been damaged, according to the country's prime minister, along with 40% of high voltage grid facilities.
What has ensued is a game of cat and mouse, as Ukrainians race to repair their grid faster than Russia can destroy it.
A detailed Sky News analysis of NASA satellite data shows the effect of attacks which, in the words of Ukraine's largest private energy provider, caused the entire system to "almost fail" in late November.
Yet British embassy officials in Kyiv have told Sky News that Ukraine still has "more than enough actual electricity generating capacity".
Why, then, are the lights going out? The answer lies in the tactics of the Russian military.
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