
North Korean leader Kim Jong Un has vowed to implement the "toughest" policy against the United States.
These statements come less than a month before Donald Trump takes office as US president.
Trump's return to the White House raises the prospect of high-profile diplomacy with North Korea. During his first term as president, Trump met with Kim three times for talks on the North's nuclear program.
Many experts, however, have said that a quick resumption of meetings between Trump and Kim is unlikely, as Trump will initially focus on the conflicts in Ukraine and the Middle East.
North Korea's support for Russia's war against Ukraine also poses a challenge to efforts to revive diplomacy, experts said.
During a five-day meeting of the ruling Workers' Party, Kim called the US "the most reactionary state that considers anti-communism as its unchanging state policy."
Kim said the security partnership between the US, South Korea and Japan is expanding into a "nuclear military bloc for aggression".
"This reality clearly shows which direction we should go, what we should do and how we should act," Kim said, according to North Korea's state news agency, KCNA.
This media outlet said that during the speech, Kim "clarified the most severe anti-American strategy. Counteraction will be launched aggressively" by North Korea for its long-term national interests and security.
The report did not provide details on this strategy against the US. But it said Kim has decided to strengthen the state's military capabilities through advances in defense technology and has sought to improve the mental toughness of North Korean soldiers.
Previous meetings between Trump and Kim not only ended the harsh rhetoric and threats of destruction, but the two leaders also forged a personal bond. However, the talks collapsed in 2019 and the US imposed sanctions on the North.
Since then, North Korea has accelerated the pace of weapons testing and intensified production of nuclear missiles to target the United States and its allies. The United States and South Korea have responded by expanding their joint military exercises, which have included Japan. The North has seen the exercises as preparations for invasion./REL