Sam,

Russia "joined" Euro Greencard insurance consortium eff. 01 Jan 2009:
http://www.horizonsunlimited.com/hub...ow-valid-40443

BUT
1) No one has reported here on HUBB actual experience of
a. first obtaining Euro Greencard that is endorsed for/ includes RUssia;
b. presenting that document at RU border crossing;
c. having that document accepted by RU border crossing authorities;
d. (much less) recognized by RU traffic police/ authorities on the road;
e. (to say nothing of) submitting claim successfully after accident in RU.

A general Google search in English displays no actual experience reports
from non-HUBB sources since the 2009 RU official announcement.
General interest RU travel sites like
Traveling to & from Russia by car, motorcycle or hitchhiking | waytorussia.net page
still reference obtaining RU insurance separately at the border.

The MotorcycleExpress policy is actually underwritten by a large Euro insurance company AXA, through a general managing agent, tourinsure.de. in Germany. Presumably AXA would not claim that its Euro Greencard covers RU without having made all the required legal/ commercial agreements with the RU authorities. (It's one thing for RU to "join"; its another for Euro (& UK)
insurance underwriters to actually include/ extend that cover. it's a third for the "policy" to work its way down to on-the-ground reality.)

RU bottom-line: it's still an unknown crapshoot

2) Beddhist is right. And both the Greencard--or separate border insurance-- are first/ foremost "just the paper to show," because there is so little actual accident/ claim experience reported. "What did your [Turkey] company do for you?" is an unknowable (anywhere in the world) until there's an actual covered accident, and then it all depends on the specific circumstances.