North Korea has said the new US sanctions targeting its leader Kim Jong-Un amounted to a declaration of a war and vowed to take strong retaliatory measures.

Pyongyang's foreign ministry in a statement said the move by the United States constituted the worst-ever hostile act and an open declaration of a war against the North Korea.

The US has placed Kim on its sanctions blacklist, calling him directly responsible for a long list of serious human rights abuses recently.

Pyongyang, in its first response to the sanctions, urged Washington to withdraw them immediately, warning that the North would instantly cut off all diplomatic channels if they failed to do so.

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