No country has the right to exist almost every single one involved some sort of war in the establishment of it's borders, or numerous outright invasions, or I you go really far back some tribe taking the land of another tribe.
Which is why the entire concept of right to exist is a glass house, America, Canada, Australia, Brazil.... I could go on and on only exist in their current forms due to colonialism (literally invading and taking lands, with some help of genocide of the current native inhabitants for good measure), and that's just relatively recent history, because that shit has been going on for thousands of years.