I have no idea why Coralynth did that. No one in Sorraine knew they were doing it. They certainly didn't need to try and do it. Everyone knew the war was going to happen.
As for Sorraine, we declared war a full seven days before the attack landed.
And Baranion, at least, has no problem with the way Sorraine has conducted itself militarily.
He is, however, steadfastly opposed to allowing Sartanism to take over the entire Far East, which appears to be Sorraine's guiding principle.