Last game we played, UK (varak) and I decided on a containment/harassing policy against Japan, all the while waiting for the perfect moment to invade Germany. We did this because Japan doesn't really have the IC to research AND build a lot, it's either one or the other, and UK and I were able to get him hurting for convoys enough that he had to divert a significant portion of his IC to building transports. It seemed to work, as I think Japan thought he was my first target, and though Germany knew of my hidden build-up in UK (50+ divisions, 30+ of them armored), I don't think he thought it was as big as it really was. If he had known, he wouldn't have invaded USSR when he did, as my tanks were rolling into Berlin and UK's were into Paris before he knew I had landed.
Our invasion of Europe consisted of 10-15 UK divisions landing near Brest in France, and the 50+ US divisions landing in NW Germany. UK was to liberate France, while USA drove hard to Berlin, catching the German army between USA and USSR.