The situation that Ukraine and Russia find themselves in today is typical of many such problems that have occurred around the world in the past 100 years or so.
I will explain.
Many times the borders of countries and even countries themselves are arbitrarily decided on political grounds or even to satisfy external pressures. Too often this does not take into account the ethnicity or political leanings of the people affected. Sometimes even large populations that consider themselves to be a national group are left stateless. The Kurds in the Middle East are a perfect example of this.
Another example of this is Hungary where now more Hungarians live outside of Hungary than within. This occurred because of the arbitrary changing of their borders after wars.
i do not know what the future holds for the Ukraine but i just wish that the powers that be would let the people decide.