The Soviet war effort without Lend-Lease

Could the Soviet Union survive the Second World War without Lend-Lease?

Probably, but in a much weaker position: Germany might take Moscow and force a deeper retreat, while Soviet industry beyond the Urals and German logistical limits could still prevent a complete defeat.

Lend-Lease materially strengthened Soviet supply and mobility, but its absence does not automatically produce a German victory. German forces might reach Moscow and drive the Soviet armies farther east. Soviet factories already moved behind the Urals could continue producing weapons, while winter and the lengthening German supply line would still obstruct the advance. The likely result in this answer is a weaker Soviet position or a stalemate farther east rather than certain collapse.