Ukrainian forces attacked the railway ferry at the Caucasus port in Krasnodar, Russia on August 22 - RIA Novosti reported, citing sources from local emergency services.
The missile attack is said to have caused a large fire and a firefighting ship was dispatched to the scene.
So far, there have been no reports of casualties. Fedor Babenkov, head of the Temryuk district where the Caucasus port is located, wrote on his official Telegram account that the targeted ferry was carrying 30 barrels of fuel.
He added that 12 fire brigades and three ambulance crews were working at the scene.
According to the Telegram channel of the Krasnodar Operational Command, more than 100 people participated in extinguishing the fire, including 43 people from the Russian Ministry of Emergency Situations, which also contributed 13 units of equipment.
RIA Novosti cited sources from Russia's emergency services as saying that five people were believed to have been on the ferry when the missile struck. According to this news agency, their fate is still unclear.