Russia Bombs Power Plants and Ukraine Targets Refineries in Dueling Attacks

As Russian missiles streaked through the skies above Ukraine before dawn on Saturday, once again targeting the nation’s already battered energy grid in a broad and complex bombardment, Ukrainian drones were flying in the other direction, taking aim at vital oil and gas refineries and other targets inside Russia.

The Ukrainian Air Force said its air defense teams had intercepted 21 of the 34 Russian cruise and ballistic missiles fired from land, air and sea-based systems, but the attack caused extensive damage to four thermal power plants and other critical parts of the power grid in three regions.

Russia’s Ministry of Defense said it had shot down 66 Ukrainian drones over the Krasnodar region, which is just across the Kerch Strait in southern Russia, east of the occupied Crimean Peninsula.

Veniamin Kondratyev, the head of the regional government, said the Ukrainian drones had targeted two oil refineries, a bitumen plant, and a military airfield in Kuban.

The Security Service of Ukraine, known as the S.B.U., said the Ukrainian military operation had targeted the Kushchevsk airfield and the Ilsky and Slavyansk oil refineries. The airfield housed “dozens of military aircraft, radars and electronic warfare devices,” the agency said in a statement, adding, “The S.B.U. continues to effectively target military and infrastructural facilities behind enemy lines, reducing Russia’s potential for waging war.”

The Kremlin tightly controls information about Ukrainian attacks, often making it difficult to assess their impact, and it was unclear how much damage the drone strikes caused.