North Korean state media said around 1.4 million young people had applied to join or return to the army this week, accusing Seoul of a provocative drone incursion that had brought the "tense situation to the brink of war".
The young people, including students and youth league officials who had signed petitions to join the army, were determined to fight in a "sacred war of destroying the enemy with the arms of the revolution," the KCNA report said.
Photographs published by KCNA showed what it said were young people signing petitions at an undisclosed location.
North Korea's claim of having more than one million young people volunteering to enlist in the country's Korean People's Army in just two days comes at a time when tensions on the Korean peninsula are running high.
North Korea has made similar claims in the past when there have been heightened tensions in the region.
Last year, state media reported on 800,000 of its citizens volunteering to join the North's military to fight against the United States.
In 2017, nearly 3.5 million workers, party members and soldiers volunteered to join or rejoin its army, the reclusive state's state media said at that time.
It is very difficult to verify the North's claims.
According to data from the International Institute for Strategic Studies (IISS), North Korea has 1.28 million active soldiers and about 600,000 reservists.
The IISS also said it had 5.7 million Worker/Peasant Red Guard reservists with many units unarmed.
In the latest sign of the growing tensions, North Korea blew up sections of inter-Korean roads and rail lines on its side of the heavily fortified border between the two Koreas on Tuesday, prompting South Korea's military to fire warning shots.
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