North Korean leader Kim Jong Un has vowed to implement the “toughest” anti-American policy, state media reported on Sunday, a month before Donald Trump takes office.

Trump's return to the White House raises the prospect of high-profile diplomacy with North Korea during his first term. Trump met with Kim three times For negotiations on the North's nuclear program. Many experts, however, believe that a quick resumption of the Kim-Trump summit is unlikely, as Trump will focus first on the conflicts in Ukraine and the Middle East. Experts say that North Korea's support for Russia's war against Ukraine is also a challenge to efforts to restore diplomacy.

During the five-day plenary session of the ruling Workers' Party, which ended on Friday, Kim called the US “the most backward country that considers anti-communism as its unchanging state policy”. Kim said that US-South Korea-Japan Security Cooperation expands into a “nuclear military bloc for aggression”.

“This reality clearly shows in which direction we should move forward and what we should do and how,” Kim said, according to the Korean Central News Agency.

It said Kim's speech “clarified North Korea's strategy to aggressively launch the toughest anti-US countermeasures in its long-term national interest and security.”

KCNA did not elaborate on the anti-US strategy, but Kim is said to have set out tasks for strengthening military capabilities by advancing defense technology and stressed the need to improve the mental toughness of North Korean soldiers.

Previous meetings between Trump and Kim have not only ended their fiery rhetoric and threats of annihilation, but also developed personal ties. Trump once said he and Kim “fell in love.” But their talks ultimately broke down in 2019 as they clashed over U.S.-led sanctions against the North.

Since then, North Korea has dramatically increased the pace of its weapons testing to develop more reliable nuclear missiles aimed at the US and its allies. The US and South Korea have responded by expanding their bilateral military exercises as well as trilateral exercises involving Japan, drawing North to strong objections, which view such US-led exercises as invasion attempts.

Further complicating efforts to persuade North Korea to give up its nuclear weapons in exchange for economic and political benefits is deepening military cooperation with Russia.

According to the estimates of the USA, Ukraine and South Korea. North Korea has sent more than 10,000 soldiers and conventional weapons systems to support Moscow's war against Ukraine. There are fears that Russia could provide North Korea with advanced weapons technology, including help to build more powerful nuclear missiles.

Ukrainian President Volodymyr Zelensky announced last week that 3,000 North Korean soldiers were killed and wounded during the fighting in the Kursk region of Russia. It was Ukraine's first significant assessment of North Korean casualties since the deployment of North Korean troops to Russia began in October.

Russia and China, locked in separate disputes with the U.S., have repeatedly blocked U.S. moves to impose more U.N. sanctions on North Korea, despite its repeated missile tests in defiance of U.N. Security Council resolutions.

Kim said last month that his previous talks with the United States only confirmed Washington's “immutable” hostility toward his country and described its nuclear buildup as the only way to counter external threats.