Did they shoot it down?
If not, then why not?
There was no it. There were 6 Russian planes.
Did they shoot it down?
If not, then why not?
The Russian aircraft were flying in international air space, so they had not yet violated the sovereign airspace of Canada or the United States. However, the Russian aircraft did penetrate the Air Defense Identification Zone (ADIZ) without an approved flight plan to do so, which made the Russian aircraft subject to military interception and escort until the Russian aircraft egressed the ADIZ.
They were in an ADIZ which pertains to Commercial aircraft and extends 200 miles of the mainland. The Russian planes were not in our sovereign airspace.
Not in US airspace.