Markdown doesn't render the link, if the URL address contains Unicode characters such as Russian:
[Тире](http://ru.wikipedia.org/wiki/Тире) vs. [Тире](http://ru.wikipedia.org/wiki/%D0%A2%D0%B8%D1%80%D0%B5)
I never encountered this before, because I never referenced Russian (or any other language) website before, but now we have StackExchange sites in different language, such as the Russian Language one.
Can we change this Markdown setting at least for SE sites in other languages? Inability to render Unicode characters can be a nuisance, especially if people don't know how to URL encode their Unicode URLs.