Canada is pretty much defenseless against drone strikes currently. no surface to air missile system to protect us or guns of anykind. 4 sentry guns on a drone with armor piercing could get you sitting on the couch seeing through the walls with thz waves/thermal cameras with pinpoint accuracy. could do a whole city or town without hassle probably. with EMI ASR shielding and stealth it would be hard for an interceptor to find. there is also plasma stealth that might be able to coat something as small as a drone can be switched on and off.