For nearly 3 months, the Space Battle of Oflea had occoured. Tens of thousands of Oskau ships would attack U.P. vessels only numbered 350 total. They thought it would be an easy fight, but as History told they would be in for a fight.
Within the Battlefield, nearly 30,000 Oskau ships would assault the nearly 350 U.P. Ships. Eventually the U.P. was forced to retreat after losing around 84 ships, but they killed nearly 22,000-23,000 ships. Those were unacceptable losses on the Oskau people's end.
The United Planets Industries start to Kickstart 3 months after joining the War, and now could easily replenish their losses after every battle. The Oskau Empire couldn't do that anywhere as efficiently.
Oflea was constantly shelled by U.P. ships and would be known as the "Shelled World". Over time, the U.P. stopped attacking Resource worlds, and Blockaded them from sending resources to the Oskau Empire.
The Oskau People only have 3-4 years worth of Rare Earth Metals remaining, and were draining them fast. Their Allies couldn't help as they are fighting a ton of Axis forces. The Oskau Empire was now facing the full might of the U.P. Military, and was not liking it.