There is a fuller article here including a map of the various sea routes used.
It was autumn 1942 before the US began supplying shipping to augment the Soviet fleet and increase the volume of supplies shipped. Note it was Aug 1943 before military Lend Lease supplies were sent by sea via the Pacific routes, and then initially via the shallow Tartary Strait route that did not involve passage through Japanese waters. So until then the Arctic convoy route, and more particularly the Persian Gulf route which was largely unaffected by enemy action, were vital to getting military supplies to the Soviets.
The Pacific route was not trouble free. Problems included:-
Climactic conditions - storms, fog, ice
Diplomatic objections from Japan from Aug 1941 into 1944
Inspections and detention of some cargoes as permitted by International Law
Shipping channels bordered by Japanese minefields.
US submarine attacks which prevented use of the southerly Tsushima Strait route between Korea & Japan from mid-1943.
Another interesting Lend Lease project involving the USSR and the North Pacific was Project Hula in 1945. That involved the transfer of frigates, minesweepers, sub-chasers and landing craft to the Soviets in the Aleutians and the training of crews to operate them.
It was autumn 1942 before the US began supplying shipping to augment the Soviet fleet and increase the volume of supplies shipped. Note it was Aug 1943 before military Lend Lease supplies were sent by sea via the Pacific routes, and then initially via the shallow Tartary Strait route that did not involve passage through Japanese waters. So until then the Arctic convoy route, and more particularly the Persian Gulf route which was largely unaffected by enemy action, were vital to getting military supplies to the Soviets.
The Pacific route was not trouble free. Problems included:-
Climactic conditions - storms, fog, ice
Diplomatic objections from Japan from Aug 1941 into 1944
Inspections and detention of some cargoes as permitted by International Law
Shipping channels bordered by Japanese minefields.
US submarine attacks which prevented use of the southerly Tsushima Strait route between Korea & Japan from mid-1943.
Another interesting Lend Lease project involving the USSR and the North Pacific was Project Hula in 1945. That involved the transfer of frigates, minesweepers, sub-chasers and landing craft to the Soviets in the Aleutians and the training of crews to operate them.
Project Hula - Wikipedia
en.m.wikipedia.org
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