I know NK's capabilities aren't tops, but 2 "failed" launches shortly after take-off within a week or so is a bit suspicious.
"US, Japan conduct successful missile interception test
February 6, 2017
The US and Japan have passed a crucial test for missile defense, shooting down a medium-range ballistic missile with a new interceptor launched from a guided-missile destroyer."
http://www.cnn.com/2017/02/05/politics/us-japan-aegis-missile-defense-test/