During World War II, something like one half of Lend Lease supplies reached Russia via Vladivostok and the Trans Siberian railroad (what I call the eastern route); one quarter to south Russia from the Persian Gulf, (the southern route); and one quarter through Archangelsk from Britain, (the western route).
The last was the shortest route, but the most dangerous because convoys had to pass German-controlled Norway through a short time window. Specifically, Archangelsk was ice bound several months a year. Also, convoys could not run mid-year because the days were too long, giving free reign to German bombers and submarines.
Was it possible to avoid some of these problems by approaching Archangelsk from the east, that is, from Alaska instead of Scotland? Or was it a matter that if the "eastern" route was used, it was easier to ship goods by train from Vladivostok than over the White Sea in the north? (Note: Under their non-aggression pact with Japan, the Soviets were allowed to import food and raw materials, but not arms through Vladivostok.)
Archangelsk : A city in the north of European Russia