Russian President Vladimir Putin, on Sunday, acknowledged that sustained Ukrainian drone attacks on Russia's energy infrastructure have caused fuel shortages in several regions, while insisting the disruptions are manageable and vowing to continue Moscow's military campaign.

Ukraine kept up its heavy drone assault on Russia, setting fire to a major oil refinery in the south.

Ukraine has markedly stepped up its long-range attacks on Russian military industries and energy facilities in recent months, aiming to cut Moscow’s revenue for its invasion — now…