i might add that the allies almost always control the uk seazone for the entire game. This is standard, and doesn’t mean they automatically win. First of all, germany can put alot of infantry in western europe. Suppose it’s turn 3, and uk has 4 transports, and usa has five, and they can all hit western europe. Germany can easily have 12 infantry (or 8 infantry and 8 tanks) plus 2-4 fighters and the aa gun. If they try to invade, they will either lose, or barely take it at high losses. If the uk buys a ton of transports, it has better chances, but it will severly delay movement of troops to karelia.
what i like to do, is put 7-8 infantry in western, and my tanks, and retreat from eastern. This way, you are using your tanks for defence which is very important, since you have a whole stack of them. Then you can hit eastern, and retreat from western, and then hit western and retreat from eastern. All the while, japan is getting big since all 3 allies are attacking germany.
The game usually amounts to, allies kill germany before japan kills russia. So as germany you usually turtle. Japan get’s big, and rolls for tech.