Russian forces struck Ukrainian power and fuel sites overnight into Wednesday. President Volodymyr Zelenskyy said hundreds of thousands of people in the Kyiv and Kharkiv regions lost power.

Zelenskyy wrote that 26 power-system sites and four oil and gas sites were damaged, CNBC reported. He said a ballistic missile strike on energy sites was deliberate. He also said Russia had shown "ostentatious disrespect toward the United States."

Al Jazeera, citing Ukrainian officials, said at least six people were killed. Two died in Kyiv's Desnianskyi district. One died in Golosiivsky district. Two died in Dnipropetrovsk region. One died in Zaporizhzhia. Mayor Vitali Klitschko said energy sites in the capital came under ballistic fire. He urged people to stay in shelters. DTEK, Ukraine's largest private power company, reported emergency cuts in several Kyiv districts.

The attack came days after President Donald Trump said Russia and Ukraine had agreed to stop hitting energy sites. Russian officials have said talks are ongoing but have not confirmed a deal, CNBC reported. Russia's Defense Ministry said it hit power plants in Kyiv and Kharkiv and a data center in Kyiv, Al Jazeera reported.

Zelenskyy also said Ukraine again got no early warning before missiles neared Kyiv. Russia said it shot down hundreds of Ukrainian drones overnight, Al Jazeera reported.

The overnight wave ended a brief lull. On Tuesday, outlets reported that Russia had hit Ukrainian cities while largely sparing energy targets for a day after Trump's claim. Wednesday's strikes put energy sites back at the center of the war.

What we know: Russia struck Ukrainian energy sites overnight, at least six people died, and Moscow still has not confirmed Trump's energy truce.
What we don't: Whether Washington will change the diesel deal or military support after the overnight strikes.