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].
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Question: (CNN) The cavalry is coming! Not exactly, but the sentiment of reassurance is the same. This week, US Defense Secretary James Mattis arrives in Asia to visit South Korea and Japan. Two stalwart US allies, policymakers in both capitals have nevertheless been shaken by statements Donald Trump made while campaigning for President. None of these was more dramatic than the suggestion that these allies should pay more for US troops or risk having these forces withdrawn. Statements like this played to the worst fears in Seoul and Tokyo that the United States might no longer be a committed ally. It is now Mattis' job to reassure them of US commitments and return the trajectory of alliance relations back to pre-2016 presidential campaign rhetoric.Jeffrey Hornung: Japan, South Korea were shaken by statements Donald Trump made while campaigningWashington's alliances with Seoul and Tokyo will be critical in managing challenges posed by China and North Korea, he says 
 Question:Given the severity of the _ threat, it is crucial they hammer out any possible differences that may have arisen since Trump became president.

Answer: North Korea


Question: (CNN) -- Iran's supreme leader took verbal jabs at the United States Saturday in his first public reaction since the United States accused Iran of plotting to assassinate the Saudi ambassador to Washington. Ayatollah Ali Khamenei labeled the allegations "meaningless and absurd." "They (the U.S.) want to isolate Iran," Khamenei said over chants of "down with America" in a speech before thousands in the western Iranian city of Gilangharb. Also, an Iranian official said claims by the United States that a high-level U.S. diplomat had met Wednesday with an Iranian counterpart over the plot were untrue. "There were no kinds of negotiations between the two countries, and there was not such a contact," said Alireza Miryousefi, press secretary for the Iranian Mission to the United Nations.NEW: Scholar says plot does not fit Quds Force "M.O."Ayatollah Khamenei calls the U.S. allegations "absurd"Iranian diplomat: U.S. claims of a meeting with Iran are not trueThe U.S. alleges Iran was involved in a plot to kill a Saudi official in the United States 
 Question:"Doing so on _ soil is unmistakably an attack on the United States, not on Saudi Arabia."

Answer: United States


Question: A former Dragons' Den star and economic advisor to David Cameron and George Osborne was today charged with sexually abusing a 13-year-old. Technology millionaire Doug Richard, 57, who appeared in the BBC show in 2005 and famously failed to invest a penny in its second series, was arrested in January. The American-born businessman was today charged with three counts of sexual activity with a child and one count of causing or inciting a child to engage in sexual activity. Crown Prosecution Service lawyer Caroline Hughes said: 'We have concluded that there is sufficient evidence and it is in the public interest for Douglas Richard to be charged.Doug Richard has been charged with sexual offences against girl, 13Father-of-three, 57, was arrested in January and denies the allegationsRichard appeared in the first two series of the BBC show Dragons' DenHe has acted as an adviser to David Cameron and George OsborneMillionaire said today: 'I absolutely deny the charges against me and will contest this matter in court' 
 Question:The US-born businessman has worked closely with Mr _ over several years.

Answer:
David Cameron