The latest brash move threatens to heighten an already tense situation on the Korean Peninsula and raises new questions about how the Trump administration will respond to Pyongyang's latest provocation.
In just over a week, North Korea has test launched at least four ballistic missiles -including one that flew over Japan, causing serious alarm on the island - and boasted about creating a warhead that could, in theory, be used against the United States.
North Korean officials released a statement a few hours after the launch confirming that they had successfully completed testing of major portions of their ideal nuclear system - a missile that, in theory, could reach the United States.
'Today's event was meaningful, for we've reached our goal of completion of national nuclear power,' said an announcement read on North Korean state television.
The statement said the test marked a 'significant occasion in attaining the final goal of completing the state nuclear force.'
In a Sunday morning tweet, President Trump called North Korea a 'rogue nation' and a threat to the United States.
'North Korea has conducted a major Nuclear Test,' said the tweet. 'Their words and actions continue to be very hostile and dangerous to the United States.'..."