North Korea's leader Kim Jong Un observed the test-firing of a long-range surface-to-air missile shortly before visiting the construction of a nearly 9,000-ton nuclear-powered submarine on Wednesday.

Kim remarked during his visit that South Korea planned to also build a nuclear-powered submarine, which would "worsen" regional stability, according to South Korea's Yonhap News Agency.

Newsweek reached out to the U.S. State Department by submission form on Wednesday evening for comment.

North Korea continues to develop weapons despite United Nations sanctions on its nuclear and ballistic missile programs—both of which continue to prove a destabilizing force for the region.

The Hermit Kingdom in October unveiled a missile allegedly capable of........

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