If you read a little further in the article you cited, you'd see:

    Among other goods, Lend-Lease supplied:

    58% of the USSR's high octane aviation fuel
    33% of their motor vehicles
    53% of USSR domestic production of expended ordnance 
    (artillery shells, mines, assorted explosives)
    30% of fighters and bombers
    93% of railway equipment (locomotives, freight cars, wide gauge rails, etc.)
    50–80% of rolled steel, cable, lead, and aluminium
    43% of garage facilities (building materials & blueprints)
    12% of tanks and SPGs
    50% of TNT (1942–1944) and 33% of ammunition powder (in 1944)[55]
    16% of all explosives (from 1941–1945, the USSR produced 
    505,000 tons of explosives and received 105,000 tons of Lend-Lease imports)

And that is to say nothing of foodstuff.

So had the the British and Americans turned on the Soviets, they would have faced Zhukov and 6.5 million soldiers, but with limited supplies fuel and bullets.