|France is a relatively weak military power in terms of the world. It has neither logisitcal nor economic capability to invade none other then it's neighbors (possibly a land invasion of England included).
What do I mean by invasion? Ability to completely invade,dominate, and ultimately totally control (not like the "green zone" areas and chaos we see in Iraq).
Germany is a possiblity but their armaments production capability is far higher then France. Spain is also a possiblity, but to be frank not possible due to the terrain(Pyrnees), and capability of the Spanish airforce (they have a significant airforce believe it or not, in fact with a budget of 8 billion annually just for the airforce.) England is a possiblity also, the French navy is significantly inferior to the English navy but it's possible to perhaps make a surprise landing.
As far as comparing France to say an India. This is ludicrous. If India wishes, (this will NEVER happen) she could invade Russia and take Moscow (without Nuclear weapons of course), this could be done fairly easily by India (perhaps with a loss of 20-30 million Indians), Indians frankly pump out more and better qualified engineers, chemist then say France and Russia combined as per the DOW chemical company R&D report in 2004, and have a better capacity to utilize these resources, the Indian economy is much bigger in production capability then say a France or Russia (as output by ODM per operating cost).
Finally, I just don't believe France has the "willpower" to do anything like an invasion. It's people are too inclined to luxuries and other wasteful and decadent excess that they will rather surrender or bargain with another power rather then fight. I do not mean to offend or upset anyone (in fact this is a complement to the highly developed social paradise setup by the French people) but the realities are that in a war France would probably roll over.