Can a Soviet Pacific fleet escape Vladivostok's geography?

Would geography and logistics trap a larger Soviet Pacific Fleet around Vladivostok?

Not necessarily; Moscow would have to expand a second Pacific base and its transport links, changing the infrastructure alongside the fleet.

Vladivostok would remain the main logistical hub, but basing the entire Pacific Fleet there would expose it to Japan and constrain its routes to open water. Smaller Soviet flotilla sites already existed farther along the Pacific coast. A larger fleet would force Moscow to turn one of them into a second naval base. Battleships and a carrier would require infrastructure beyond what the existing flotilla bases could provide. The fleet's geography changes only when shore infrastructure changes with it.