Leader Kim Jong Un guided the test, and warned it would make enemies "experience a clearer security crisis, and constantly strike extreme uneasiness and horror into them."
In the exercises, a ballistic missile equipped with a mock nuclear warhead flew 800 km (497 miles) before hitting a target under the scenario of a tactical nuclear attack.
The sister of North Korean Supreme Leader, Kim Jong Un, warned that if the US interfered with North Korea's missile tests, it would be taken as a 'declaration of war.'
South Korean lawmakers are claiming that North Korea may be able to test a new intercontinental ballistic missile in as little as a few weeks.
North Korea has over recent decades suffered serious food shortages, including famine in the 1990s, often a result of natural disasters such as floods damaging harvests.
Pak Jong Chon was noticeably absent in photos released on Monday of Kim's New Year's Day visit to the Kumsusan Palace of the Sun.