I think the most important thing is that it's just the beginning. Who cares if they're only Mi-35s? That's not the point. A huge taboo has been broken. Can anyone here imagine Russia selling *any* kind of military equipment to Pakistan even 10 years ago? Essentially, Russia has realized India is no longer as loyal as it once was and Russia is paying that "loyalty" back in kind.
Who says Mi-28s won't be sold to Pakistan down the road? If I were an Indian, I would most definitely be concerned at this development.