The Russian state-owned shipbuilding firm USC has confirmed it will take full ownership of the financially challenged Arctech Helsinki shipyard from its current owner, the Korean company STX, according ot the Finnish newspaper Yle. United Shipbuilding Corporation (USC) already holds a 50 percent stake in Arctech, and will now take full control when it buys out STX, says Yle, referring to a report in the Russian newspaper Kommersant. Citing USC's head of communications, Aleksei Kravchenko…