File photo of the Yuri Dolgoruky nuclear submarine near Severodvinsk

The Yuri Dolgoruky, a Russian nuclear submarine, is seen in the waters off Severodvinsk in this July 2, 2009 file photo. The submarine, slated to carry Russia’s next generation of strategic missiles, has been called back from sea trials, possibly delaying deployment, a top weapons designer said on Monday. The Borei-class submarine was designed to carry the nuclear-capable Bulava intercontinental missiles, which the Kremlin hopes to make the cornerstone of its arsenal over the next decade. REUTERS/Alexander Zemlianichenko/Pool/Files (RUSSIA POLITICS MILITARY)