The ATP and the WTA decided after the Russian invasion of Ukraine to allow Russian tennis players to compete in tournaments, but without national insignia. That is not enough for Wimbledon, so the Grand Slam has the discretion to decide for itself who can and who can not.
Suspension would certainly be a strong blow to the ambitions of Danil Medvedev and Andrei Rublev, who are in the TOP 10 tennis players on the ATP list.