Without Russia, it would be a loss 100%. Without USA, Germany would stand a chance of doing better...but still not
so clear.
Re Molotov Pact - yoo are right. Stalin was happy to take opportunity to get some territories back. and I am educated (just a little bit) above the school level
.
Stalin was masterminding plans that were similar to Hitler's - taking over the world and later on - he may have attacked Germany first! However, it does not take anything from the fact that the WW2 - Russian contribution in defeating Germany was the key one! Re Australian Involvement....Japanese knew Australians were there (they were mostly losing though - just like in the WW1) but I doubt Germans even knew Australia was fighting against them.
And was it a good idea for Australia to participate in WW2?