I do have the data for how much materials the USSR got through the western allies. It was actually quite staggering.
I also have numbers about how much of the USSR resources such as oil and wheat fell into German hands. Also quite impressive.
As for Mussolini, he went to the same channel as some others....thinking that the Germans had the Brits in the bag. Brits in bag = let's go grab.
Those who took that conclusion were the Italians, and then the Japanese.
(Japan was NOT after U.S's resources, but since the USA and UK were getting into the same boat, the U.S. Navy would have to be neutralized for Japan to have their peace to overtake the weakened UK's resources in the far east)
The Italians attacked the French when France was about to fall. They took a tiny part in the BoB. Then, beliving that Britain was on the knees, they went for some colonies in N-Africa. Same to the Balkans. In all cases, Germany had to make a rush to fix things. And it was at times, costly.
The Japanese, pressed by the U.S. embargo, either had to bow, or go for resources. They decided to go for the UK's troubled colonies rather than their former foe, the USSR. UK was in trouble, and their colonies close and rich of necessary materials. But the USA would have to be "castrated" in order fot the Japanese to gain some proper hold. So basically, Japan chose the UK & USA instead of the USSR because the UK was in trouble already with Japan's ally.
Bottom line, UK's existance as an enemy of the German REICH, changed the whole decision-making of the Italians and the Japanese.
As for the USSR, I remind you guys that Molotov was also stating his demands for the setup if the UK would go to it's knees.....he wanted access to the med and atlantic as well as through the Suez....from the black sea.
So in short, USSR, Germany, Italy and Japan were all drooling over the gains of a broken British empire....