will there be war or racial riot?
Of course, at first, we will be slamming each other in the media. But we're unlikely to end up in aggression. Both countries will surely attempt to uphold the apparent good bilateral ties. For economic reasons, obviously. I don't think either of is is willing to risk losing money over such petty 'sibling' squabble.
the people will not have war or racial riot at all
but it will give space to both political leader too start fighting for media attention to gain citizen support from each country
after all is always 'them' that started all this cold war stuff and we get into trouble for that