As opponents who had nearly gone to war with the Kree Empire, the Nova Corps still understood the Kree Empire very well. They also knew exactly how high Ronan's status and civilian influence were within the Kree Empire.
That much could be inferred from the fact that Ronan had slaughtered so many planetary civilizations and still had not been expelled from the Kree Empire. After all, Ronan had destroyed the peace agreement between the Kree Empire and the Nova Empire because of it, yet he had not been punished, or even forcibly recalled by the Kree Empire to stand trial. From that alone, one could tell just how lofty Ronan's position was.
But now Ronan was dead, and the person who had killed Ronan was closely connected to Star-Lord and the others. Star-Lord and his group had even appeared on Xandar. This made the already somewhat panicked Nova Empire even more panicked, because they feared that once the Kree Empire learned of this news, it would immediately go to war...
To say the Nova Empire dared to go to war with the Kree Empire was really only because the Nova Empire had no other choice. When the Kree Empire proposed a peace agreement, had the Nova Empire not wanted to agree to signing it without a second word?
In truth, the Nova Empire also knew that if a real war broke out, the Nova Empire could not possibly be a match for the Kree Empire. The Nova Corps' technology was generally focused on defense and did not have much aggression or offensive power. So if possible, the Nova Empire definitely did not want to go to war with the Kree Empire.
And now, the appearance of Star-Lord and the others, along with the news they brought, undoubtedly placed tremendous pressure