Take into account a very large Soviet air force.
Adolf: Quick Joe, let's take thousands of your troops on a suicide mission to Western Europe, without the proper number of airfields, or proper supplies, creating an ideal logistical situation. And then, let's have them fly missions, putting strange planes bearing Communist markings in the skies over Britain, which wont at all lead to friendly fire incidents, especially as half of them can't speak German and the other half don't have radios! Oh, and let's not forget about the RAF, they're sure to just let our vast, uncoordinated and undersupplied airfleets bomb them into oblivion. It wont at all be a turkey shoot.
Stalin: Indeed! And while we're at it, let's send the Red Army, which has demonstrated its vast logistical and operational acumen in the Winter War, to help with the invasion!