Error creating link

When creating a topic as a link, it does not recognize the Cyrillic alphabet either explicitly or in the form of codes. Swears that the link is incorrect.
Takes neither
ru.wikipedia.org/wiki/Food_Additives (automatically recognized in the text)
neither
http://ru.wikipedia.org/wiki/%D0%9A%D0%B0%D1%82%D0%B5%D0%B3%D0%BE%D1%80%D0%B8%D1%8F:% D0% 9F% D0% B8% D1% 89% D0% B5% D0% B2% D1% 8B% D0% B5_% D0% B4% D0% BE% D0% B1% D0% B0% D0% B2% D0% BA% D0% B8
(done with href)
neither
href tag with any of them.
Can allow tagging in the header when creating links?