Ukrainian authorities have accused Russian forces of trying to cripple Ukraine's power grid. Photo: AP PHOTO

Ukrainian strikes have disrupted power and heating to two major Russian cities near the Ukrainian border, local Russian officials say.

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Russia and Ukraine have traded almost daily assaults on each other's energy infrastructure as US-led diplomatic efforts to stop the nearly four-year war have stalled.

Elsewhere, Ukrainian Foreign Minister Andrii Sybiha accused Russia of deliberately endangering nuclear safety, as he said its mass drone and missile attack on Friday struck subs

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