The order for the Volga-Don Max ships was revealed on its website.
The 5,589-dwt vessels are already partially built.
The yard said the combined carriers can load oil and dry cargo, plus containers.
Russia's Okskaya Shipyard (Oka) is building a series of small river-sea tankers for an unnamed owner.
The order for the Volga-Don Max ships was revealed on its website.
The 5,589-dwt vessels are already partially built.
The yard said the combined carriers can load oil and dry cargo, plus containers.