
Given the following passage

"Relocating his court from Jianzhou to Liaodong provided Nurhachi access to more resources; it also brought him in close contact with the Khorchin Mongol domains on the plains of Mongolia. Although by this time the once-united Mongol nation had long since fragmented into individual and hostile tribes, these tribes still presented a serious security threat to the Ming borders. Nurhachi's policy towards the Khorchins was to seek their friendship and cooperation against the Ming, securing his western border from a powerful potential enemy.",

answer the following question. Note that the answer is present within the text.

Question: Why did the leader of the Liadong territory had to seek allies to fight a potential power army? 

hostile tribes, these tribes still presented a serious security threat to the Ming borders
