Ukraine launched a new wave of attacks inside Russian territory Sunday, killing at least two people, including a teenager, according to local officials, as Russians cast ballots on the final day of a presidential vote set to extend President Vladimir Putin's rule for another six years.

Authorities also said that a drone fell on a refinery in the Krasnodar region, sparking a blaze that was extinguished a few hours later. A worker at the refinery died of a heart attack, officials said.

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