New Delhi, May 30 -- Ukrainian unmanned aerial vehicle operations ignited blazes at multiple Russian oil infrastructure locations overnight leading into Saturday, according to Russian administrative sources, marking the newest offensive against Moscow's economically critical energy sector.

Regional leadership in Russia's Rostov territory reported that descending wreckage from an intercepted drone ignited a fire that compromised an oil storage site and a cargo vessel within Taganrog's port, while leadership in the adjacent Krasnodar territory documented a similar fire tearing through an oil facility in Armavir due to falling debris.

"Another facility of Russia's oil industry has been reached - Armavir," Ukrainian President Volodymyr Zele...