North Korea will launch its "toughest" ever strategy to counter the United States, state media said Sunday, reporting on a key year-end party meeting overseen by leader Kim Jong Un.

North Korea, led by Kim Jong Un, is adopting its toughest strategy against perceived US aggression, notably due to strengthened US-South Korea-Japan military ties. The strategy, set for 2025, includes leadership changes and intensified defence capabilities.

North Korean leader Kim Jong Un held a policy-setting key meeting of the country's ruling party last week ahead of the new year, state media KCNA reported on Sunday. The "strongest" response strategy towards the United States was declared during the party meeting for the country's safety and national interests,