US deliveries to USSR Delivery was via the Arctic Convoys, the Persian Corridor, and the Pacific Route. The Arctic route was the shortest and most direct route for lend-lease aid to the USSR, though it was also the most dangerous. Some 3,964,000 tons of goods were shipped by the Arctic route; 7% was lost, while 93% arrived safely. This constituted some 23% of the total aid to the USSR during the war. The Persian Corridor was the longest route, and was not fully operational until mid 1942. Thereafter it saw the passage of 4,160,000 tons of goods, 27% of the total. The Pacific Route opened in August 1941, but was affected by the start of hostilities between Japan and the US; after December 1941, only Soviet ships could be used, and, as Japan and the USSR observed a strict neutrality towards each other, only non-military goods could be transported. Nevertheless, some 8,244,000 tons of goods went by this route, 50% of the total.