Spellchecker from Yandex

Hi!
I often use this plugin on my sites. Now i need to add spellchecker service. I choose solution from Yandex (I need the Russian language).

plugins: [ ...,
      "... spellchecker"],
    toolbar: "insertfile undo redo | spellchecker | styleselect ...",
    // Spellchecker
    spellchecker_languages: "Russian=ru,Ukrainian=uk,English=en",
    spellchecker_rpc_url: "http://speller.yandex.net/services/tinyspell"

So we need to include “spellchecker” plugin in tinymce init but how to do it using the plugin?

P. S. Maybe include “spellchecker” from TinyMCE Advanced?

https://ww.wp.xz.cn/plugins/advanced-tinymce-configuration/