Wrong.
You source claimed you only use "the" when referring to a region.
That is false.
Palestine is a region, and you do NOT refer to "the Palestine".
That is because Palestine is SINGULAR.
There is only one of them.
But the Ukraine is plural.
There is no way to drop the "the".
The Ukraine refers to many different provinces with many different ethnicities.
It is not and never can be singular.
It us similar to the US.
It is always going to be "the US" because it is plural.
"The United States".
You would never say, "US just launched a mission to the moon".
You would always instead say "the US just launched a mission to the moon".
It is wrong to just say Ukraine and always will be.
The Ukraine does not get any say, because rules of language belong to us, not the Ukraine.
If the Ukraine think they are being slighted, they are just ignorant.
The Ukraine is NOT a slight at all.
It is just recognizing the factual truth that it is comprised of many separate provinces.
Anyone who does not say "the Ukraine" is just ignorant of the English language.