A top North Korean official warned Sunday the U.S. “will find itself in a very grave situation” after President Biden called the country a security threat during his first policy speech to Congress last week.

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Why it matters: The threat underlines the challenges Biden faces as he seeks to break away from the failure of predecessors to overcome differences with North Korean leader Kim Jong-un’s regime over denuclearization and sanctions, which have crippled the isolated nation.

Context: In his speech to Congress last Wednesday, Biden said the nuclear programs of North Korea and Iran were “a serious threat to America’s security and world security,” which he vowed to address through “diplomacy and stern deterrence.”

Read more at Axios.