After looking at the save, I see that we can easily gain access to China's mainland. But since their MPP with Greece is still in effect, I would still like to see us take on France after(or even better, before) a quick liberation of Russia.
We should also gain an RoP with England if we don't already have one. This would grant us quick access to the former Roman empire now held by France, so that we may become the fifth and final home(Rome, Persia, America, France, then us) of those cities. They should be easy to take as France will most likely have them guarded by offensive units.
With the following in mind, we should consider attacking France first:
1. The bulk of our forces are already there.
2. France is very close to getting its tanks, so that threat should be removed immediately.
3. Finally, Russia is still mostly roaded territory since they just got(or will soon get) Steam Power. Waiting to attack them until they get a better rail net will give our troops more mobility when the time comes. Quick in, quick out, on to the next victim.......