There's a saying, "only a thief commits theft for a thousand days; no one defends against theft for a thousand days".
Indeed, because of this, opening up another front is imperative.
"It's not just about having the highest combat power,"
Dr. Mu shook his head,
"Even if we conquer the land, it will be hard to hold onto unless the Federation starts a large-scale migration, but that's not possible at the moment."
"Moreover, if we show that we have the power to swallow up the Oasis, all powers within the Oasis will unite against us. This has happened more than once in history we've collected and is also the main reason for the chaos in the Oasis until now—the continent doesn't need a true ruler."
"Therefore, the current strategic direction of the Federation is 'focusing on points to affect the whole, radiating across the Nine States'."