This is probably in protest to the joint South Korean and American military exercises going on, which occur every year. North Korea doesn't take kindly to military exercises so they just launch missiles so someone will remember they exist.
Thoughts?
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[quote]This is probably in protest to the joint South Korean and American military exercises going on, which occur every year. North Korea doesn't take kindly to military exercises so they just launch missiles so someone will remember they exist.[/quote]You pretty much summed up my thoughts in the OP.