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].

Let me give you an example: For four years we have waited expectantly for the pitter patter of tiny paws. Soon, that wait could finally be over. Tian Tian, the UK's only female giant panda, has conceived and could give birth to a cub as early as August. However Edinburgh Zoo, where the pandas live, have warned people 'not to get too excited' as the process is 'extremely complex'. Moreover, on the two previous occasions keepers inseminated Tian Tian - whose name means 'Sweetie' - she has failed to produce a panda cub. She was artificially inseminated again in March this year, but keepers at the zoo say implantation - when a fertilised egg attaches to the uterus - has not yet occurred.Tian Tian has conceived and could give birth to a cub as early as AugustShe has been inseminated twice before but so far failed to produce a cubTian Tian and Yang Guang arrived in 2011 from China to great fanfareOn loan at £600k a year, became first giant pandas to live in UK for 17 years 
 Questions:Under the terms of the agreement any cubs will return to _ at the age of two, the age at which they would normally leave their mother in the wild.
The answer to this example can be: China
Here is why: This is a good example. Based on the passage, any cubs will return to China at the age of two

OK. solve this:
Hong Kong (CNN) US Secretary of State Rex Tillerson heads to Asia later this week for a regional meeting on security issues, which is expected to be attended by ministers from North Korea, China, South Korea and Japan. It could be an opportune moment for a diplomatic breakthrough on Pyongyang's nuclear and missile programs, which have been causing massive headaches for US President Donald Trump. But questions linger over whether Tillerson can speak for his administration given contradictory remarks from US politicians. "The Trump administration is still scrambling to find a policy on North Korea. They're still seeking an easy solution when none exist," said Adam Mount, a senior fellow at the Center for American Progress.Top US officials haven't been consistent on North Korea policy, analysts sayOn July 28 North Korea tested missile that could potentially hit US mainland 
 Question:Some policies and talking points have remained unchanged, the biggest being that negotiations without _ committing to denuclearization up-front are a non-starter.
Answer:
North Korea