I would tell them as little as possible and give them a +60 bid for allies and you take axis for yourself. When they loose they will ask why and learn a whole lot
Why is surrender not an option in the original game?
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Yes, way before.
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Maby if the allies are winning they could make your stay at the game verry annoying.
Once japan lost its fleet and has the US parked around its mainland its as good as dead.So maby the allied player could first capture all the islands japan has with a single transport. Your turn will consist of skipping because no money and nothing to move. Allied player will have all countries to play with guess you will get bored from the game.