The situation in Iran is an internal matter. What the West could do is impose even more sanctions on Iran and cut diplomatic ties with the regime. Or maybe in an act of protest send solely female ambassadors and instruct them to never veil their hair.
This is a revolution of the Iranian people – if a foreign power attempts to intervene, the mullahs would be vindicated – that it was a ploy to invade the country. Not everything is solved with occupation.