https://www.epo.org/en/service-support/faq/searching-patents/asian-patent-information/russian-federation/filing-grant/can

Can I claim priority for an application filed in Russia?

Yes. The priority period is 12 months from the earliest priority claimed, as stipulated in the Paris Convention. Russia has been a member of the Paris Convention since 1 July 1965. A certified copy of the priority document must be filed within 16 months from the earliest priority date.

Domestic priorities can be claimed within 12 months from the date of first filing in Russia. If a later application claiming domestic priority is filed, the earlier application is deemed to have been withdrawn.

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