Slaughterbots

EW: Electronic Warfare; any action involving the use of the electromagnetic spectrum (EM spectrum) or directed energy to control the spectrum, attack an enemy, or impede enemy assaults

CIWS: Close-in Weapon System; a point-defense weapon system for detecting and destroying short-range incoming missiles and enemy aircraft which have penetrated the outer defenses, typically mounted shipboard in a naval capacity. A gun-based CIWS usually consists of a combination of radars, computers and rotary or revolver cannon placed on a rotating, automatically aimed gun mount.

Wild Weasel: an aircraft, of any type, equipped with anti-radiation missiles and tasked with the Suppression of Enemy Air Defenses. In brief, the task of a Wild Weasel aircraft is to bait enemy anti-aircraft defenses into targeting it with their radars, whereupon the radar waves are traced back to their source, allowing the Weasel or its teammates to precisely target it for destruction.

TTP: Tactics, Techniques, and Procedures; The role of TTPs in terrorism analysis is to identify individual patterns of behavior of a particular terrorist activity, or a particular terrorist organisation, and to examine and categorize more general tactics and weapons used by a particular terrorist activity, or a particular terrorist organisation.

I think that we don't have effective countermeasures now; you just have to expect and tolerate drone strikes just as you have to expect and tolerate artillery strikes.

CIWS systems are rare, bulky and expensive - you can use them to protect certain high-value targets (e.g. ships) but they don't scale to protect infantry emplacements, moving vehicles or the perimeter of large bases.

Anti-air missiles work against the larger (and more dangerous) UAVs, however, the problem is that if you have to shoot down cheap drones with the current very expensive missiles, then you still lose on a cost/efficiency basis.

The role of aviation a couple decades ago involved a limited amount of very effective but very expensive aircraft - and we have effective but expensive countermeasures. The current situation involves lots of cheap aircraft hitting expensive targets (e.g. tanks and various vehicle-based weapon systems). So we need either to have lots of cheap countermeasures, or accept the drone reality which means that high-value targets don't survive, so instead of a single great but expensive tank you'd need perhaps four quadbikes with rocket launchers, or a dozen small unmanned tracked vehicles.