Is cracking down on “Londongrad” likely to hurt or help Russia?

Will cracking down on "Londongrad"^* likely hurt or help Russia, based on economic theory or experience in other countries?
Londongrad tries to kick its 30-year Russian money habit
On the face of it, this will prevent evasion of Russian taxes and prevent ill-begotten Russian funds from being laundered profitably by UK companies (resulting in the wealth staying in Russia).

*Part of London, UK where many Russian expats live.