Whether or not the incursion of at least 19 Russian drones into Poland on the night of 9 September was deliberate or not, NATO’s response will provide the Kremlin with a clear indication of whether it can continue to escalate military aggression against its security members without meaningful consequences to it. This is particularly useful information for Moscow to know, as the four-yearly ‘Zapad’ joint Russia-Belarus military exercises began on 12 September and are due to end on the 16th of this month. The last time the exercises…