If you add the links via the Insert Hyperlink option present on the toolbar, the links will be converted to [punycode][1] & URL encoded. 

Example: 

- [президент.рф][6] 


  [1]: http://en.wikipedia.org/wiki/Punycode
 [6]: http://%D0%BF%D1%80%D0%B5%D0%B7%D0%B8%D0%B4%D0%B5%D0%BD%D1%82.%D1%80%D1%84