Starlink’s Elon Musk has categorically denied Starlink sales are happening in Russia.
Elon has denied the claims that SpaceX is selling Starlink terminals in Russia and to my knowledge no one has proven this claim wrong.
Even if you were to obtain one it simply just wouldn't work because it is not enabled there as it is not enabled in the occupied territories either, inlcuding Crimea which is why the Ukrainian attack there failed. Not because Elon disabled it, but because it wasn't enabled in the first place. This would be against the US sanctions to Russia.
If Russia was able to obtain these terminals which they obviously can do then the only place they would be able to use them is within close proximity to the front lines where they do work because otherwise Ukraine couldn't use them either. Only way to disable these Russian terminals would be to do it individually device by device.