You have 9-10 rounds of pacific before you have to worry about a VC Europe win.
Are you really going to lose USA/Canada? No. Realistically after that you lose egypt/volgograd if anything.
Make sure you shift your AA guns from West to East (I usually keep them all in central and shift them when a threat comes near). After London his boats will not be able to fully load. If he positions west germany and can load all his boats up and then head to gibraltar… you can slap some naval down East USA.
Rounds 1-5 is when Russia is sending mech to Asia. That is when you make your dent on Japan. Typically sea lions feature delayed Japan DOW and if that is the case, your Pacific campaign should be easy. UK and ANZAC should always take 2 islands round 1, if no DOW comes round 2 then you take the other 2 islands (anzac NO and celebes for UK pac).
If Japan does not delay war… you can liberate london in a timely fashion, simply bring all your ships to the atlantic and build transports with inf/arty (carriers here n there to pack fighter/tacticals).
Generally speaking Japan delays war till round 3 or 4. So you can bring the entire allies to the Pacific. Remember Japan can only win 1 major battle in a round so if he has to decide between China, Russia, UK Pac, or Naval attack… He gives up on the other 3 for that round.
China should focus on the burma road. Russian mech should be on top of China’s stack. So if Japan sends air to attack it, he gets punished hard.
The first choke point you want to hold is Yunnan, typically after Japan DOWS or after you DOW on Japan (typically you DOW on Japan only if Japan has not DOW on round 3). After yunnan, you want to advance. If Japan has walled off with his planes/men… well the next wave(s) of Russian mech is typically going toward Manchuria.
Japan has to fend off the allies from every territory it possesses against every allied power.
Things to note: 1) whatever mech Japan cannot kill goes back to Russia. 2) Dutch islands for UK pacific is worth more than USA. 3) Dutch islands for USA is worth more than ANZAC. These are minor priorities, your main objective is to shut Japan out ASAP so you can respond in time for Europe.