The U.S. ambassador to the United Nations says the agenda of the U.S.-North Korea summit next month should be the complete denuclearization of North Korea.

Ambassador Nikki Haley said Thursday that President Donald Trump will seek North Korea's complete denuclearization when he holds the first summit with that country's leader Kim Jong-un sometime before the end of May.

Haley was giving a lecture on U.S. diplomacy at Duke University in North Carolina.

Voice of America cited her as saying that the conversation between Trump and Kim has to be about denuclearizing. 

She said if Kim does not choose his country's complete denuclearization, then the U.S. will deal with it accordingly. 

Haley said that North Korea is now suffocating, adding that strengthened global sanctions led by the Trump administration have worked in getting the North to sit down for dialogue.

She stressed, however, that sanctions won't be eased only because Pyongyang comes to the talks and that the U.S. is going into the summit very cautiously.

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