What is the deadline for submitting an amended claim set? Can this deadline be extended?

In Russia: Voluntary amendments may be filed (i) together with the request for substantive examination (ii) during a one-month period from the national entry date based on the Regulations under the PCT; (iii) in response to an office action; (iv) in response to a report on accelerated search, if requested by the applicant; and (iv) together with the request for patent prosecution highway (PPH) procedure.

In Eurasia: Voluntary amendments to the claims, description and abstract of the application may be filed any time before issuance of a patent. If the amendments are filed within the period of 2 months from the entry date, no official amendment fee applies.