Yandex is capable of sending DMARC compliant email because they support custom SPF and DKIM configurations that achieve DMARC alignment.
The link just below is a resource on how to configure this source to send DKIM-aligned email on your behalf. You will complete this configuration by (1) following the source's instructions and (2) adding the required entries into your DNS. https://yandex.com/support/business/dns/dkim.html?lang=en
The link just below is a resource on how to configure this source to send SPF-aligned email on your behalf. You will complete this configuration by (1) following the source's instructions and (2) adding the required entries into your DNS. https://yandex.com/support/business/dns/spf.html?lang=en