I’ve played games yesterday as allies and won them against the other player. We had played before using the same sides and I lost. Here’s my impressions of what happened and what you described:
The initial Russian opening is pretty much standard, he should have lost 3 inf according to probabilities but G will lose 2 of the following 4 territories to R on the first round: Ukraine/West Russia/Bielorussia/Norway.
G has to push Russia back on the first or second turn. Buying only inf for G on round 1 is not the best choice (the allied player did it on both my games). Ideally, if you buy 5 tanks you can be able to make Karelia impossible to take by the Russians (depending on the number of russian casualties and their initial purchase). If that’s not possible then you will have to take and hold Karelia or Ukraine somewhere on the following rounds.
What you do regarding the Brit fleets really depends on how much you want to risk sacrificing your air force. Taking out the UK Battleship and the Transport with the sub, fighter and bomber gives some breathing room for G on the Atlantic, along with killing the Cruiser. And don’t forget to move the G subs.
Regarding J it really depends on what R and the UK have made. If they are playing aggressive then you’ll have 6 inf on Buryatia, UK controlling Borneo and New Guinea, UK fighter on US carrier on Hawaii. Your first buy should be 2 transports and 1 destroyer, in any case. You’ll need the DD do deal with any allied subs, while the factory can wait a little longer. With Japan I’d say that the US fleet is the biggest target, followed by China and Borneo. If R moved to Buryatia leave 1 inf behind in Manchuria and land as many fighters as possible there.
If the US goes Pacific (like I did on my games) and starts building a fleet, then your focus is to prevent the US fleet from invading either East Indies/Borneo/Phillipines and building an IC there. You’ll need some infantry to drop on Asia using the transports available but combat ships and planes have the highest priority. On Asia focus on taking India, the Chinese territories and the 3 Russian territories. Don’t leave your ground units where they can be destroyed by allied counterattacks.