Sky News analysis shows Russia has increased its attacks on Ukrainian energy systems in recent months, as experts warn the country remains "vulnerable" without stronger air defences to protect its critical infrastructure and the frontline.

Using news reports, energy data, geolocated video and satellite images, Sky News looks at the extent of the attacks and what they tell us about the state of the war in Ukraine.

Read more: https://news.sky.com/story/russia-ste...

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