North Korea reportedly holds live-fire drill as US nuclear-powered sub approaches

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North Korea on Tuesday reportedly conducted a huge live-fire drill that involved up to 400 artillery pieces, which may have been supervised by the country’s leader, Kim Jong Un, as the U.S. added a nuclear-powered submarine to its fleet of vessels powering toward the region.

Pyongyang apparently deployed long-range artillery units in the coastal region of Wonsan, an unnamed government source told South Korea’s Yonhap news agency. South Korea’s military did not confirm the report, but told the news outlet it was “firmly maintaining readiness.”...

http://www.foxnews.com/world/2017/04/25/north-korea-reportedly-conducts-massive-liver-fire-drill-amid-tensions.html

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Pyongyang apparently deployed long-range artillery units in the coastal region of Wonsan

They are still fighting like it is 1950. Wonsan isn't in range of South Korea so they probably think they will use those to take out Naval forces or repel a land invasion.
https://www.google.com/maps/place/Wonsan,+Kangwon,+North+Korea/@39.1540957,126.8817125,9z/data=!4m5!3m4!1s0x5fd7056d015e34fd:0x547c2226d8a09bd5!8m2!3d39.1538529!4d127.4460001

If things go hot, those units will be taken out long before any Naval forces are even close to within range.