Rus­sia launched a sec­ond ma­jor drone and mis­sile bom­bard­ment of Ukraine in four days, of­fi­cials said Tues­day, aim­ing again at the pow­er grid and ap­par­ent­ly snub­bing U.S.-led peace ef­forts as the war ap­proach­es the four-year mark.

Rus­sia fired al­most 300 drones, 18 bal­lis­tic mis­siles and sev­en cruise mis­siles at eight re­gions overnight, Ukrain­ian Pres­i­dent Volodymyr Ze­len­skyy said on so­cial me­dia.

One strike in the north­east­ern Kharkiv re­gion killed four peo­ple at a mail de­pot, and sev­er­al hun­dred thou­sand house­holds were with­out pow­er in the Kyiv re­gion, Ze­len­skyy said. The day­time tem­per­a­ture in the cap­i­tal was -12 C (around 10 F). The streets were cov­ered with ice, and the city rum­bled with the noise from gen­er­a­tors.