Nazi Germany posed a huge threat to the whole world, but the attack on the USSR was the most important mistake of this ambitious and bloodthirsty leader in the entire history of the modern world. Hitler was fond of the occult sciences, looked for ancient artifacts and possessed the "Spear of Destiny". Before every major attack, he spent hours in the lance room, anticipating the coming conquests.
But could it have turned out that Hitler would have been able to take over the world and the USSR would not have resisted the onslaught?
Everything depended on the position of America and Great Britain. Initially, they behaved rather sluggishly and did not accept either side. There is even evidence that states supported Hitler's campaign with cash while the situation was relatively controlled. In general, the United States often conducts such a policy, undermining global stability, and while it remains in their interests, the US authorities will not lift a finger to stop wars and change of political regimes. On the contrary, they are helping to remove leaders by staging a coup in countries that benefit them.
And if they had decided to the end and did not begin to create a coalition against Hitler, then the USSR might not have resisted. The economy of the United States and Great Britain could destroy the allied countries of the USSR and we certainly would not have survived, it seems to me. But it's good that this did not happen and we were able to destroy the dictator. Unfortunately, many European countries have forgotten how our soldiers liberated the occupied countries and cities, so is it worth it after that to harbor the illusion that they will not stick the night in the back of Russia when it is profitable for them?