Is it possible to sail into Vladivostok all year round? One source in Wikipedia about Vladivostok says:
The port is ice-free all year round
The locality of the bridge crossing construction site is characterized by severe climate conditions: temperatures vary from -31 °C to 37 °C; storms bring winds of up to 36 m/s and waves of up to 6 m in height; and ice formations in winter can be up to 70 cm thick.
What to make of this? Is the port ice-free only because of icebreakers?