The Ambassador told Fox News: “If you think of this missile trial compared to the one before it certainly had advances.”
She said she was pleased with the progress made by the US in convincing Russia and China to cooperate with the aim of preempting a nuclear strike by North Korea.
She said: “I also think that something that is happening is pretty interesting which is the United States has managed to rally the entire international community to come towards North Korea to say they have to stop this and they can’t have nuclear weapons.
“And they have acted passing the resolution to have the sanctions on North Korea.
“We even have China and Russia involved on both. And 90% of their trade and 30% of their oil has been cut off.
“They are feeling the squeeze but they have made progress.”
North Korea though decided to ignore international sanctions and continued its ICBM tests.
On Wednesday US Ambassador John Bolton said: “”From all that we can see, North Korea is very close to a point where they can deliver thermonuclear weapons to any target they want in the continental United States.
“Obviously, once they achieve that point the odds of us doing anything militarily approach zero because of the risk of retaliation against us.”
US military air drills also continue since Monday and until Friday in South Korea.
Mr Bolton believes “there isn’t a lot of time to fool around” and if Donald Trump doesn’t act fast he runs the risk of a nuclear attack from North Korea.