Yes, very quickly.
Use of satellites--we'll be launching very soon RADARSAT-2, which has unprecedented radar coverage day and night, in all weather, to look at movements on the ground, with three-metre resolution.
We are now getting equipped with uninhabited aerial vehicles that can be flown--the U.S. is flying them, and we've flown them in Afghanistan. It's a major means.
Then we have excellent ground surveillance radar, like the Coyote reconnaissance vehicle, which would help out. We even have underground means, using ground-penetrating radar to look for weapons underneath the ground, or mass graves, if you want to find sites of atrocities. There are also seismic sensors, so that when people or vehicles are passing by a point, we know they're going there. That's one way of intercepting any fighting forces, by getting advance warning they're coming there, using the air to be able to do the reconnaissance and then have an intercept mission.