Important mechanism to freeze assets of Yanukovych and co. How can we make this happen here in the US and in Europe?

Ukrainian NGO Центр Протидії Корупції found another way to freeze Yanukovych and co assets without sanctions. Apparently, Yanukovych, Azarov and Klyuev have registered their assets and properties with the same American lawyer. At the same time American anti-corruption law prohibits banks to deal with corrupt politicians (PEP). There’s ample evidence of corruption by Ukrainian government officials, basically none of their activities are corruption-free, therefore it will be very easy to prove this and freeze their assets. We just need to stimulate American and European banks to start investigation. What is the best way to do it, friends? We need to hear the opinion of American lawyers.
Explanation in Ukrainian by Daria Kaleniuk
Reinhard Proksch is the US lawyer, who is helping to hide assets of Yanukovych, Azirov and Kluyev:
https://www.facebook.com/rjproksch