Make their grievances known in the fora where the sanctions have been decided upon, indicate that they are going to suffer disproportionally, demand to be made good on and indicate that if that does not work that they will have to get creative.
These are harsh times, I don't think any of this is fair per se but at the same time once India becomes the conduit to evade the sanctions there will be far larger trouble.
Watch this video to get an idea on what the mood currently is: