McMaster said new sanctions on North Korea are just going into effect and need to be given a chance to work. A trio of missile launches and a hydrogen bomb test that is the communist nation's most powerful to date.
North Korea yesterday fired an intermediate range ballistic missile over Japan and into the Pacific Ocean.
And what have the USA and its allies achieved?
"We ought to make clear what's different about this approach is that we're out of time", McMaster said. He called on China and Russian Federation in particular to use their ultimate leverage over North Korea.
Diplomacy on the North Korean nuclear standoff has been stalled for years.
For the first time, he will attend the annual United Nations General Assembly in NY, which brings together leaders of the 193 member nations for a week of meetings and speeches. A new set of United Nations sanctions that even Trump declared a "small step", extensive talks and a rhetorical two-step that leaves them where they have been for years.
U.S. Secretary of State Rex Tillerson also called for "new measures" against North Korea and said, "These continued provocations only deepen North Korea's diplomatic and economic isolation". But the North has ignored countless worldwide reproaches previously.
With San Francisco or NY in Kim's cross-hairs, would President Trump risk war with the North to defend Seoul or Tokyo in a future crisis?
"For those who have been commenting about the lack of a military option, well, there is a military option". "Now it is not what we would prefer to do". Now, however, with North Korea perilously close to being able to directly threaten USA cities with nuclear obliteration, the worry for some is that Pyongyang could blackmail Washington into qualifying or limiting its support for its allies in the region.
The North Korean state-run newspaper Rodong Sinmun on Friday said in an editorial, "If the USA continues to walk on the current course, we will take stronger actions for our self-defense".
After addressing the General Assembly Tuesday morning, Trump will meet with senior United Nations officials and the Emir of Qatar, a key regional ally which he has accused of backing terrorism in recent months. "This includes the regime of North Korea, which has once again shown its utter contempt for its neighbours and for the entire world community", he said. The US ambassador to the UN, Nikki Haley, said trade with North Korea would be cut 90 percent after the massive sanctions package agreed by the Security Council.
Trump has been consistently critical of the United Nations, once calling the global organization "a club for people to get together, talk and have a good time". But, unlike past presidents, Trump is promoting his "America First" agenda, and he has called for slashing US financial contributions to the United Nations. "I have no problem kicking it to Gen. [Jim] Mattis, because I think he has plenty of options". "Hopefully there will be coordination with allies on their policy lines before he adds anything to the speech about North Korea".