A drone has struck an airfield in the Russian region of Kursk bordering Ukraine, setting fire to an oil storage tank, the regional governor said on Tuesday.
"There were no casualties. The fire is localised. All emergency services are working at the site," Governor Roman Starovoyt said on the Telegram messaging app.
He later said that the region had held a meeting of its "anti-terrorist commission". He did not say who was responsible for the incident.
Firefighters are currently working to tackle the blaze, which spans 500 square meters, the RIA news agency reported.
The city of Kursk is about 100 kilometres (62 miles) from the Ukrainian border.
Russia has previously accused Ukraine of carrying out drone strikes inside Russian territory, including on Monday when two air bases hundreds of miles from Ukraine were hit.
(Reporting in Melbourne by Lidia Kelly; Additional reporting by Caleb Davis; Editing by Kim Coghill and Peter Graff)
