Croatian tycoon Danko Koncar is getting closer to adding Finland's Arctech Helsinki Shipyard to his shipbuilding empire.

Russian state owner United Shipbuilding Corporation (USC) plans to close the sale of a controlling stake in the near future, its president Alexei Rakhmanov told journalists, according to Interfax.

"We are in the final discussion stage with the potential buyer. In essence, there is just one issue.