Yandex AJAX爬行

For AJAX crawling of Googlebot I use "_escaped_fragment_" argument in my website.
Now I checked Yandex's search results for my site.
I saw that AJAX reponses don't exist in search results.
Is there an option for Yandex like "_escaped_fragment_" ?

Else, should I check user agent and if user agent includes "YandexBot" then serve non-AJAX page?

Thank you

I found out that Yandex also supports Google's proposition for AJAX crawling. No need to change any code if you optimized your site for Googlebot crawling.