He is the Chairman of USM. Owned by an Oligarch in Usmanov, Skoch a mobster who is a member of the Russian parliament and himself. The whole point of sanctions is to punish Putin and his inner circle financially.
Even if his assets aren't frozen. He has no way of exchanging roubles for sterling or Dollars. You brought up PSR calculations for the Premier League's financial fair play rules. Well the only way we passed in the last accounts is because USM pumped in tens of millions for the right to bid for naming rights. There is no way that will happen again. So who pays the bills now ?