Blasts heard in Kyiv, Zaporizhzhia and the Black Sea port of Odesa as Poland scrambled fighter jets within its airspace as a precaution

Blasts rang out across Ukraine’s capital Kyiv and other cities early on Sunday, as Russia staged its biggest missile attack since August and targeted power facilities with the winter setting in, officials said.

Ukrainians have been bracing for a major attack on the hobbled power system for weeks, fearing crippling damage to the grid that would cause long blackouts and build psychological pressure at a critical moment in the war Russia launched in February 2022.