Since the hacking of the Sony pictures in which the U.S. points hand to North Korea. This have created a bad blood between the two Nations with threats being thrown here and there.

The U.S. had even threatened to put North Korea back on its list of terrorism sponsors.
The U.S. terrorism list once contained North Korea's name until 2008, when it agreed to full verification of its nuclear sites.
Although, North Korea denies the attack over The Interview, which depicts the fictional killing of its leader Kim Jong-Un, it is said to have praised the deed as a righteous one.
Also, recent reports say that the North Korean Internet system has been shut down. if this turns out to be true, the obvious suspect is the United States.
President Obama promised/threatened a response to the Sony intrusion "in a place and time and manner that we choose". It would be proportionate.
"As we implement our responses, some will be seen, some may not be seen.", a spokeswoman for the administration revealed.
This has made some tech experts to conclude that If immediate care is not taken, there is possibility of a third world war (that doesn't sound nice).
However, most Asian countries are staying on neutral grounds, not blaming North Korea despite condemning the attack.

source:
http://techwhizandy..com/2014/12/the-north-koreansony-hack-scandal-world.html

The next would be too hi-tech 4 naija to participate.