Of course, one way to improve the situation would be to null out the offending noise with a loop - if the wanted signal from ZL comes over the pole, and the unwanted signals originate in Russia, this should work fairly well - does anyone know what bearing a signal from ZL should arrive on?

ZL is very much antipode from us so the bearing epends very much on the
location in ZL, there about degrees difference between the north and south
of ZL :
north-ZL = 30° shortpath / 210° longpath
south-ZL = 80° shortpath / 260° longpath

73, Rik  ON7YD