Photo by Sergei Chuzavkov/SOPA Images/LightRocket via Getty Images

KYIV—On Christmas morning, a popular app that notifies Ukraine’s residents of danger showed the entire country as a red zone—Russia was shelling again. Heavy anti-aircraft booms could be heard somewhere on Kyiv’s outskirts, and authorities warned of fighter jets in the air above Belarus that could carry hypersonic missiles. But despite the ongoing missile strikes and significant power shortages that have plunged the...

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