In my opinion on this topic if the Germans had more manpower they could quite possibly have won ww2, there were several flaws in the Germans plans such as on the battle of normandy on the english channel I think the allies set up a fake flank with wooden tanks and soldiers, making hitler or the commander in charge if the regime to send half of their tanks and men to the flank weakening their hold and allowing the allies to get past, if hitler wanted to keep italy by his side there was plenty he could've done to keep italy from leaving, if hitler didn't attack Russia in a surprise attack he would have kept that power and possibly won the war and have total control, but he screwed himself and was trying to be a 1 man army practically pushing hi allies away.
Even if they had, the combined bombers of the UK and US would problably be enough to still win the war, and the fighters would problably take them all down, adding to the Anti Aircraft.
The correct answer is that Russia and Britain sent troops to protect their interests there. This was aimed at ensuring that the countries had substantial influence in order to restrict foreign access. Oil was an important resource and still remains important as an energy source
