Pakistan, June 29 -- Ukraine says it has carried out drone strikes on two Russian oil refineries as it continues to ramp up its air attacks on Russia's energy infrastructure.

Ukrainian President Volodymyr Zelenskyy said that the military hit the Slavyansk and the Yaroslavl refineries, about 300 and 700 kilometres (190 and 435 miles) from the front line, respectively, overnight with long-range drones.

"We continue our operations that weaken Russia's ability to wage this war," Zelenskyy wrote on X on Sunday, saying each attack "means fewer resources serving Russia's war machine".

A fire broke out at an oil refinery in Slavyansk-na-Kubani in Russia's Krasnodar region, Governor Veniamin Kondratyev said on his Telegram channel, and several ...