to this:

"People who speak "in Ukraine" are the same people who speak "in Rostov". We need to teach them how to speak "in Uganda")"

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In the lifetime editions of D. E. Rosenthal’s reference book on spelling it is written that: “The combination in Ukraine arose under the influence of the Ukrainian language (p.: in Poltava, in Chernigov) and supported by the expression on the outskirts".
As we can see, from which country to approach, but better, more worthy and more independently to live... in Ukraine!

As for the general rule governing the use of excuses “in” and “on” with the names of countries, locations and islands (in Uganda, Uruguay, Paraguay, but in Ukraine, Kuban, Cuba), there is no clear separation.

Learn the mother tongue