According to South Korea's National Intelligence Service, new amendments to North Korea's Constitution were allegedly adopted during a session of the Supreme People's Assembly in Pyongyang.
Reportedly, the new provisions entail automatic use of nuclear weapons in response to a threat against the nuclear forces management system. This implies an immediate response without further deliberation or decision-making.
Given that Kim Jong Un is the supreme commander, any attempt on his life could be seen as a threat to North Korea's nuclear capabilities.