Answer:
A) The Chinese Empire does not have good relations with the tribes on it's northern Border.
B) An example is that of the Mongol Emperor Genghis Khan and his successors who seriously challenged China's dominance
C) The Emperor's purpose was to develop a overall foreign policy and a defense policy that will shape the Empire's relations, resources and politics.
Explanation:
A) The northern plains of Gobi desert were home to numerous small tribes who not only fought with one another but constantly raided Chinese territory. This was one of the main reasons for building the 'Great Wall' as a fortification.
B) Gengis Khan and his successors looked at the Chinese capital as the key target to invade. Within a couple of years, the mongols were able to capture large parts of mainland China and even take Beijing, which they called Khanbaliq.
C) The aim of issuing this policy was to develop a long-term vision for the Chinese Empire which would be followed by generations to come. By clearly laying out threats and limitations of the Empire, the aim was to build resources to make sure, they can defend against intrusions while enjoy cordial relations with most neighbours.