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This is Moskva, an icebreaker owned by Rosmorport a Russian Federal State Unitary Enterprise charged with the development of the Russian sea transport infrastructure. This being high summer she is back in the port where she was built - possibly in the same boatyard having a refit.
The marked channel extends miles out from the port
The Peterhof is somewhere hereabouts
Mole stretches south from Kronstadt with this gap closeable with massive gates