That all depends. Russia excels in nuclear and radioactive material. If Russia and thee USA were to go to war, yes, Russia would be an absolute threat. Especially for civilian bombing. America excels in air force and navy, and their navy holds the ginourmous Super-Carrier currently making their navy most likely the best in the world. North Korea holds an extremely powerful army. North Korea is also a huge threat to the US, but in a different way. The only other country that posts a small threat to the US, is England. England is the only other country in the world that has the legendary aircraft carriers. England's soldiers are also much better prepared and trained for battle than America's. England trains their soldiers very well. All in all its a matter of opinion. I personally think Russia is the biggest threat. However I doubt any pf these countries would go to war, because that would bring terrible consequences because of the raw power of these nations.
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