I just knew that at some point there would be an incident in which a missile would miss Ukraine and strike a neighbouring country and thus change the scope of the invasion.
So far Russia is, of course, denying that they had anything to do with it despite the FACT that they are bombarding Ukraine with missiles. Perhaps it was an accident, a miscalculation or something like that.
But, perhaps it was a deliberate "test" by Russia to see how NATO will react.