Possible drone attacks against key energy infrastructure are a serious threat to Russia's energy security, Energy Minister Nikolai Shulginov said on Tuesday.
Shulginov did not mention Ukraine by name, but Russia says it has foiled a number of attempted Ukrainian drone attacks in recent months.
Ukraine has not publicly acknowledged launching attacks against targets inside Russia, but senior officials in Kyiv have on occasion appeared to welcome the news of successful drone attacks on Russian soil.
