If you are making a flight with a transfer from international airlines to domestic ones, then the question may well arise what to do with alcoholic beverages or other liquids bought in dutifrey duty-free stores. Here's a ready answer:
In theory, all air passengers know that it is impossible to carry liquids in hand luggage into the cabin of the aircraft, and it is not always safe to pack fragile glass containers in luggage, because it may simply not reach its destination in integrity. In addition, if you are traveling with a flight with a transfer from an international flight to a domestic one on a ticket issued on one form, usually the baggage is processed to the final destination, and you will receive it at an intermediate airport in order to repack, it simply will not work.
Fortunately, this problem is solved quite simply. Russian aviation rules allow carrying on board the aircraft (in hand luggage) goods purchased in duty-free shops (dutifry), if they are packed in a sealed (sealed) plastic bag, and its weight and dimensions do not exceed the norms of the carrier's hand luggage.
In other words, you can safely carry alcoholic beverages bought in dutifrey stores in your hand luggage on board a domestic airline if they are packed in a special plastic bag (they must be packed when selling), and this package will not be opened. Also, at the security control at the airport, you may sometimes be asked to present a purchase receipt, so it is better to keep it until the end of flights.