When you post an answer with more then 200 internal links, only the first 200 are automatically converted to show question titles. All internal links after the first 200 just display the URL.
Those aren't internal links. The answer sits on meta.ru.stackoverflow.com; the links point to ru.stackoverflow.com. Those are separate sites with separate databases and every title lookup has to go through the API as balpha explains here (hat-tip Laurel for the reference).
The limit for cross-site lookups for posts on a meta site is 200 (has been since 2012, but not consistently documented).