State media published images showing the North's leader standing next to what it said was a miniaturised weapon.
The claim is impossible to verify from the images alone and experts have long cast doubt on such assertions.
The North has stepped up its bellicose rhetoric in response to the UN imposing some of its toughest sanctions.
The move by the Security Council came after the North conducted its fourth nuclear test and launched a satellite, both of which broke existing sanctions. >
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