If he is going hard on Russia and is deliberately trying to keep the USA out of the war, then you really need to strengthen the impact of the UK globally.
UK Pacific: If he is not choosing to declare war on the UK Pacific with Japan than you will be able to easily get the Dutch East Indies. This can boost UK Pacific’s income by more than 10 which will help them build up. If he is sending units into Siberia you can recognize that he is avoiding victory cities. Japan can’t win without getting 6 victory cities so what you do is you can fortify Hawaii, Calcutta, and Sydney. Especially if he is not declaring war until around turn 4. UK Pacific also starts with 3 AA guns which can be powerful against Japan’s large airforce. Additionally, since it sounds like he is really focusing on China, then the best thing you can do is protect the fighter plane. The Chinese fighter plane can land in Burma which the Japanese cannot attack unless they declare war on the UK. His strategy of not attacking the UK with Japan reduces the impact of the USA and keeps them out of the war. You can turn the tables by preserving your units and possibly forcing him to have to change tactics.
On the European side
In my experience the Taranto raid is so debilitating against the Italian invasion of Africa that Britain can normally clean up any chances of continued Italian relevance in the Mediterranean. Even if Germany successfully captures Moscow he will need either London or Cairo to win the game.
With England try this general plan: Attack SZ 97 with Bomber, Carrier, Tactical Bomber, 3 Fighter, Destroyer, Cruiser. Attack S96 with Fighter and Cruiser. (If the Cruiser at SZ 91 sunk send the cruiser that would have attacked SZ 97 to this fight. Sink any remaining Germany navy with your destroyers near Canada or London. Non combat you can land at Malta and pull your forces back to Egypt. You can also get Persia or if you wanted during combat attack Iraq. Italy’s remaining fleet is not large enough to take on your two navies in the Med and the French navy. Your’re surving navy and aircraft should be able to move to the Mediterranean and finish off the Italian navy. I don’t think you need a factory in Egypt. The units London starts with can supply troops from South Africa or India to Egypt. Once Italy can no longer transport units to Africa you can convoy them.
After the situation in the Mediterranean is free then you can focus on Germany. You have to disrupt Germany’s focus. Germany can make a lot of money on the European board, but its not enough to fight 3 players at the same time. If he is not attempting Sea Lion than you can prepare your own invasion fleet. Carriers and fighters can protect your ships and you can use those fighters as escorts in bombing raids against Germany. Some people also like to land in Norway early. Germany normally has to commit air power to retake Norway if they lose it. However due to the NO capturing Norway reduces Germany’s income by 8. If you can hold Leningrad you can attempt a joint defense.
You can lose Moscow and still win the game. It is important to take out Italy’s power in the med early. Once Cairo and London are safe German really only has one way to go and they can’t capture Moscow before the USA enters and turns the tide.
If Germany is buying large amounts of aircraft or submarines you should try to buy destroyers and antiaircraft guns.