What is the deadline for paying the annuities? Can a missed deadline be restored?

In Russia: No annuities are paid during the formal and/or substantive examination of a Russian application. The accumulated annuities beginning with the third year and each subsequent anniversary of the filing date that occurs prior to grant of the application are due upon grant of the application. Further renewals are paid for each year, which follows after the patent is granted by the date corresponding to the filing date. Belated payment is possible within 6 months after the due date with 50% fine. Restoration of a patent is possible within 3 years from the last missed due date.

In Eurasia: A renewal fee for a Eurasian Patent is equal to the aggregate sum of renewal fees established by each country party designated by the Applicant. The Applicant can pay renewals for all or for some countries, or even for one country. The first renewal is payable when the patent was granted. The first renewal is equal to the sum of the renewals for the current and all preceding years. Belated payment is possible within 6 months after the due date with 50% fine. Restoration of a patent is possible within 3 years from the last missed due date.