World War III

No need to worry brother.

In terms of overall strength and numbers, the US would crush North Korea no doubt. They wouldn't stand a chance to the military of the United States, we spend way too damn much on our Military. We've got all the brand new toys and tons of people at the ready.
I wouldn't be afraid of war.

As for Russia, eh. It's a fair fight, I don't think we could stand to lose though.