Russian President Vladimir Putin has ordered retaliation after a Ukrainian drone strike on Starobilsk killed at least 12 people.
Putin accused Ukraine of a "terrorist" attack on a college dormitory, while Ukraine says it targeted a drone headquarters.
Ukraine has intensified longer-range drone attacks on Russian military facilities in recent weeks, hitting targets deep inside Russia.
AI-generated summary was reviewed by a CNN editor.
Russian President Vladimir Putin has ordered retaliation to a deadly Ukrainian attack on what he said was a college dormitory in an occupied town which authorities say killed at least 12.
