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

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 substations that power two nuclear power plants.

And Kremlin spokesman Dmitry Peskov said Russia intended to honour its obligations under a global nuclear test ban despite a recent order by President Vladimir Putin to study the possibility of resuming atomic tests.

A drone strike temporarily caused blackouts and cut hea

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