Spellchecking simultaneously for Russian and English in OS X

The spell checking service in OS X has one major drawback. There is no way to check the spelling of words in mixed text. It is possible to check either the spelling of English words (Russian will not be checked) or the spelling of Russian words (English words will be underlined as misspelled words). In the service settings, it is possible to select a multilingual check, but for some reason, the Russian language is not included in this group of dictionaries.
This topic describes instructions for enabling spell checking in mixed texts.

Step-by-step instruction:

1. you need to download and install cocoAspell , which is an adaptation of the good old aspell for mac os x;
2. the next step is to download a dictionary with Russian and English words;
3. put the unpacked directory with the dictionary into ~ / Library / Application Support / cocoAspell;
4. in the System Preferences application, select Spelling, in the list of dictionaries mark the Russian dictionary (in my opinion, change the name for this dictionary, for example, for RuEn to easily find in the list of dictionaries) and close System Preferences;
5. To check the result of the above actions, you can run TextEdit, select the dictionary "RuEn (Aspell)" in the spell-checker settings and try to write with errors in Russian and English.

The spelling checker settings window is called up by the key combination  +: (cmd + shift +;).
Spelling settings are set separately for each application used (at least I have not found where you can install globally).

To use this dictionary in Pages, you need to select it for a document in the Inspector -> Text -> More -> Language window