Question

[Dustin Hosseini]

You would be taking a considerable risk.  

Having recently flown out of Sheremetyevo, I remember that the Visa/Consular
Office was not always open, and in fact, did not have hours posted from what
I remember.

I would advise that you go through a reputable visa agency that could get
the extension for you, without the trouble of having to go all the way out
to the airport and being rejected.  

There is a very reputable agency, called Liga Consultant, which has
regularly assisted foreigners in obtaining visa invitations, registration,
and even extensions.  The contact there is Vadim.  You can find a lot of
good comments about this company and Vadim on Expat.ru and Redtape.ru.  

Their number is +7.499.978.1529.

Good luck,

Dustin

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