>> The start of the United Nations General Assembly this week marks one year since US President Donald Trump hurled insults at North Korea's leader and threatened to, quote, totally destroy the country.>> Rocket Man is on a suicide mission for himself and for his regime.>> But now after an unprecedented summit between Trump and Kim Jong-un over the summer and a vague but optimistic pledge from Pyongyang to work toward a denuclearization, the tone between the two leaders couldn't be more different.
>> Success, it was tremendously successful.>> Still, the two sides have agreed to few concrete measures. And on Sunday, UN Ambassador Nikki Haley, said the US demands more than positive rhetoric from Pyongyang.>> What the United States is looking for is denuclearization with complete verification that they are actually stopping their nuclear program.
>> While the US and North Korea say they hope to resume direct talks on the sidelines of the General Assembly this week. America's top diplomat, Mike Pompeo, faces a separate challenge, wrangling the Security Council to stick with strident sanctions against Pyongyang. Reuters UN Bureau Chief, Michelle Nichols.>> On Thursday we're going to see Secretary of State Pompeo chair a UN Security Council meeting on North Korea.
We're starting to see splits in the unity of the council.>> Russia is actively working to undermine the enforcement of the Security Council sanctions on North Korea.>> So I think the aim of this meeting is going to be the Americans really trying to pressure Russia and China to keep implementing the sanctions on North Korea until they start to see North Korea take steps towards denuclearization.
>> Trump has long been skeptical of the United Nations. And a day before descending on the world body's annual gathering, he released this message.>> The United Nations has tremendous potential, but it has not lived up to that potential.>> The US President's views don't appear to have changed.