It depends.
If russia has a citystate possession in east africa or india, like portugal had goa and france had... ?pondicherry?, the nothing much chages, really.
If, however, you mean extend the ,stans, south, either taking over persia or conquering afghanistan and baluchistan, then the changes needed to ALLOW that to happen are bigger than the direct consequences.
The first result will be, as falecius says, britain going bananas.
But having an indian ocean port before about 1900 would be a huge liability because moving supplies or troops or whatever, would be very difficult across a thousand miles or whatever. Of course, once they can get rail that far, its a different matter.