I would say that the notice to airmen, the NOTAM, is the awareness mechanism that Russian-owned, -operated, -leased and -controlled aircraft—for Belarus aircraft, it's now the same—are banned. It's the responsibility of aircrew to be aware of the NOTAM. It is the international norm to be aware of NOTAMs that may impact their flight plan.
We are also aware that Russia is very aware of the action we've taken, because the day following, they referred to that ban by banning Canadian aircraft as well.