Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Washington (CNN) President Donald Trump issued an extraordinary ultimatum to North Korea on Tuesday warning Pyongyang not to make any more threats against the United States or they will "face fire and fury like the world has never seen," during a photo op at the Trump National Golf Club in Bedminster, New Jersey. "North Korea best not make any more threats to the United States. They will be met with fire and fury like the world has never seen... he has been very threatening beyond a normal state. They will be met with fire, fury and frankly power the likes of which this world has never seen before," he said.US intelligence analysts assess North Korea has produced a miniaturized nuclear warhead, according to multiple sourcesIt is not believed that the capability has been tested 
 Question:The officials all note that the evidence shows _ is making progress and the question is more about when not if North Korea is capable of launching a nuclear capable missile.

North Korea