I think that, given some time, Russia will improve the post-sale support considerably. I don't think Russian post-sale support will even be comparable, never mind on par with, Western post-sale support. Nor is post-sale support one of the ways Russia gets customers.
Look at the experience with the OAO Oboronservis for domestic post-sale support. It's been fairly problematic, and it was backed by considerable political power and administrative resource. I.e. the defense establishment was forced to work with the new way of maintaining and repairing military equipment. However it still hasn't become a permanent addition, it's future is in question. And corruption is rife.
EDIT: Case in point. South Korea has been using Ka-32 helos for nearly 20 years. Only now is Kamov setting up a maintenance and service center in South Korea. They might be doing so in hopes of selling more helos there, since the Ka-32 has reportedly performed well, there were some rumors of additional sales being negotiated, but nothing concrete.
Ð’ Южной Корее открылÑÑ Ð¿ÐµÑ€Ð²Ñ‹Ð¹ центр по обÑлуживанию роÑÑийÑких вертолетов Ка-32Т - Сделано у наÑ