If there was a mortgage on a piece of real estate for an individual who was under the sanction, that individual wouldn't even be able to buy out that mortgage from the financial institution if he wanted to quickly try to protect his asset. It's not as though he could take cash from another institution and rifle it over there, pay off the mortgage and have a piece of real estate that would be unencumbered. As soon as someone is sanctioned, the financial institution is also responsible to make sure that there are no further transactions in regard to any mortgages or deposits—any financial instruments.
On May 27th, 2021. See this statement in context.