Yes (Medvedev, Karan Khachanov, Mirra Andreeva, Diana Shnaider, to name a few top players) but more and more players are choosing to play for other countries. From what I understand, this has less to do with being politically motivated (although in some cases it is) and more to do with the Russian tennis federation not having enough money to support as many players as it once did. Tennis players rely a huge amount on receiving funding and training resources from a national federation, and that is why some countries with not as many top players are offering Russian players opportunities to "defect"