The destroyers' back-to-back commissioning instilled fear in the enemies as the nuclear armament of North Korea's navy made it possible to exercise its nuclear deterrent in a more diversified, practical manner: Kim Jong Un North Korean leader Kim Jong-un commissioned his second naval destroyer and called for building a more reliable nuclear deterrent, state media reported on Monday, as the US, South Korea and Japan began a trilateral military exercise he views as a security threat. Key points and original sources are listed below.

• The destroyers' back-to-back commissioning instilled fear in the enemies as the nuclear armament of North Korea's navy made it possible to exercise its nuclear deterrent in a more diversified, practical manner: Kim Jong UnS1

• North Korean leader Kim Jong-un commissioned his second naval destroyer and called for building a more reliable nuclear deterrent, state media reported on Monday, as the US, South Korea and Japan began a trilateral military exercise he views as a security thre...S2

• North Korea says leader Kim Jong Un has commissioned his second naval destroyer and called for building a more reliable nuclear deterrentS3S4