that more or less will assure an AD coming out to ground those MSNs known to be in Russian control.
if the aircraft come back to the lessors at any time in the future, they will be evidence of criminality in bogus parts which is a felony in most states in the world. The civil torts would be fairly clear, would think exemplary damages would be on the table, so don't expect the return of the evidence to lessors anytime at all.