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: Hong Kong (CNN) The North Korean foreign minister and US Secretary of State walk into a room together. The world isn't waiting for a punchline; they're waiting too see what Pyongyang and Washington's top diplomats will do when they sit down in the same room for the first time. On Sunday, Ri Yong Ho and Rex Tillerson will both be in the Philippines for the annual Association of Southeastern Asian Nations' (ASEAN) Regional Forum, a dialogue to discuss security issues which includes 27 countries. It's the highest-level annual encounter between North Korea and the United States, says Mike Fuchs, a former deputy assistant secretary of state for East Asian and Pacific affairs, and the first during the Trump administration.US secretary of state and North Korean foreign minister attending ASEAN-sponsored security dialogueTensions in the South China Sea will also be on the agenda 
 Question:With the success of the recent _ missile tests, Pyongyang's diplomats could believe they have the upper hand at the moment.

North Korean