Which Allied power did Nazi Germany have a better chance against solo?
Britain/US or the USSR?
The USSR may or may not have Lend Lease.
Who has a better chance of defeating Nazi Germany if Germany's entire resources were devoted to fighting them and them alone? The US and Britain or the USSR?
This is Germany as it was on the eve of Barbarossa in June 1941. If Germany fights the USSR solo, the other Allied powers can't give any more help besides lend lease. If Germany fights the WAllies on their own the USSR doesn't attack Germany. ASB of course but go with it.
Germany's allies are still on their side (Italy, Bulgaria, Romania etc)