North Korea

Mattis said there was little chance North Korea could use Olympics talks as a wedge to set Washington and Seoul at odds.

A North Korean missile launched last April crashed into a town near Pyongyang, possibly causing an explosion and casualties.

The rocket would be outfitted with re-entry capability -- a feat North Korea's last ICBM wasn't able to achieve.

Defense Secretary Mattis noted that military exercises have been rescheduled in the past for political or diplomatic reasons.

The North Korean regime seems rattled by the presence of the USS Michigan near the Korean peninsula.

Satellite images released by the U.S. Department of Treasury appeared to show vessels illegally trading oil in the West Sea.

The response follows a unanimous vote Friday by the U.N. Security Council for tougher measures against Kim Jong Un's regime.

Zukunft said he could provide few additional details about the Coast Guard's prospective role in a North Korea campaign.

Chief of Naval Operations Adm. John Richardson also voiced no objection to South Korea's plan to develop a nuclear sub.

A think tank colleague of Defense Secretary Jim Mattis has warned against war with North Korea.