Russia's newest ballistic missile submarine, Project 955 Borey class boat Yury Dolgoruky, will be handed over to the fleet in September. "The formal signing of the handover of the Yury Dolgoruky to the defence ministry will take place in September," a source at the United Shipbuilding Corporation said on Friday. The boat has completed a range of sea trials including a firing of a Bulava ballistic missile in December 2011. Its sister ship, the Alexander Nevsky, will carry out a further Bulava test launch in November "as part of its state trials".