At least three people were killed in Russia's Rostov region Thursday in Ukrainian overnight drone attacks, the regional governor said, despite continuous efforts to stop the war.

An attack caused a fire on a cargo ship in the port of the regional capital, killing two crew members and injuring three, acting regional Gov. Yuri Sliusar said on Telegram. The blaze was later extinguished.

A civilian was also killed and six others injured in the town of Bataysk, near the port facilities, he said.

"Municipal commissions will document all the consequences of the attack," Sliusar said.

Ukraine has been stepping up nightly drone raids deep inside Russian territory, targeting energy infrastructure that Moscow relies on to fund its offensive.