This is largely a matter of opinion as 'most powerful' is not easy to define. The following list is at least an approximation to a valid answer. People may argue over the relative status of these nations.
In terms of nuclear weapons, Russia has the the largest stockpile, (more than all the other nation's nuclear weapons combined), with the US having the second largest arsenal, but the most technologically advanced (more bang for the buck).
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The third strongest army in the world is the Indian Army dues it size and it is also the third strogest airforce
I think one result was that Germany had the strongest army in Europe, and the second strongest navy (only second to England)
strongest army man is in Pakistan
The belief that your nation should have the strongest military/navy/army in the world.
China have Biggest Army in The World :1,600,000 And India Have second largest Army: 1,100,000
it was the strongest economy in the world