And no other country ever won a war in Russia on their own.
Hitler was delusional if he thought he would ever be able to conquer Russia, and take control of it. First of all, it's too vast. It would never have happened. Secondly, Germany was never going to be able to keep up the mass production of the military machinery it needed to continue to wage war. The allied countries outproduced both Germany and Japan when it came to mass production. Hitler himself said he would have to wage constant war to achieve his goals, and keep what he'd conquered.
Germany was never going to be able to confiscate enough oil and gas resources, nor manufacture enough synthetic gas to successfully power their war machinery in order to win WWII. Hitler bit off more than he could chew, and ended up making the people of Germany reliant on Russian energy for 70+ years.
If Germany had ignored Greece and started earlier, they probably could have taken Moscow. Losing Moscow might have stopped Allied help to Russia because Germany could not advance any farther than Moscow due to conditions but they could intercept any shipments to the Soviets.
But nothing could have been worse than Hitler dismissing jet engines in 1939.