"We are studying measures such as tracking and shooting down (parts) of a North Korean missile in case they stray out of their normal trajectory" and violate South Korean territory, said Yoon Won-shik, a vice spokesman at the Defense Ministry.
One of these days, North Korea is going to provoke South Korea into retaliation. It will escalate, pulling in Japan and America, and end with South Korean troops holding an enclave north of the DMZ to keep North Korean artillery out of range of Seoul.
After that, we'll see if China can finally restrain their little rabid pet or if the Chinese panic and occupy Pyongyang.
I don't believe North Korea has nuclear weapons yet. At best they have a nuclear device that requires an army of scientists and technicians to detonate in a laboratory environment. So they play a dangerous game of bluff that they can't back up.
We shall see if mid-April, when the North Koreans say they will launch their missile, is that day.