[OCC]

"We have responded in the traditional way to Russian incursions of our airspace by meeting them as they enter our airspace

So are they entering Canadian airspace or not?

[AntiKev]

Technically no. But Canada and the US both have what is called the “Air Defense Identification Zone” which extends beyond their internationally-recognized airspace. The idea is that all intercepts occur in this area so that the enemy doesn’t get the chance to hit something of value on land.