Firefighters are still tackling a blaze in the Russian town of Azov following drone strikes yesterday morning.
A Ukrainian intelligence source said the strikes were conducted by the security service of Ukraine and targeted an oil depot in Azov, situated in the southern region of Rostov.
Several oil storage tanks were engulfed in fire which is still raging today.
"The fire at the Azov district has been localized at the 3,200 square metres at 5:30am (2am GMT)," local emergency services said on Telegram today.
Kyiv has often said that targeting Russia's energy, military and transport infrastructure undermines Moscow's military effort.
