They never released any official statements condemning the war or leaving russia, none of their services were shut down there, and they still actively hiring new people in russia. Yandex services is also widely known for spreading pro-war propaganda, disinformation and fakes while censoring opposition media: https://meduza.io/feature/2023/01/30/yandeks-blokiroval-izob...,
https://meduza.io/news/2022/03/01/yandeks-segodnya-klyuchevo...