Spoken like a true optimist.
It is best to look at this as an economic stimulus for Ontario. The $9B price tag is for the whole package, including the new air force bases, repair facilities, training facilities, spares production, and so on, over the next ten years. An existing programme such as the CF18 will always seem cheaper, since a lot of that already exists. Ontario's economy is in the gutter and they need something to get them going again. It is a Federal way to force Alberta to bail out Ontario, without stepping up the transfer payments.
The actual planes are not particularly useful at defending Canada against the occasional rogue polar bear or dead bloated whale...
Where do I begin?
a. Any country that has nuclear reactors can be safely assumed to have a few strategic nuclear bombs stashed down a deep mine shaft. Plutonium has a 25000 year half life, so once you have them you have them. You just have to make triggers regularly.
b. Nuclear bombs are obsolete. It is not necessary to destroy a whole city. Precision guided missiles and bombs are much more useful and cheaper.
c. Russia is not our enemy. Russia is an ally. Russia has never attacked Western Europe or North America, it was always Western Europe attacking Russia, or Western Europe descending into a civil war, then requiring Russia to help fix the mess.
d. Russia is the Slavic big brother that always has to come to the rescue of his little Slavic brothers. They like doing that time and again, just as little as the little brothers like getting slapped upside the head each time.
e. Hysterical propaganda doth not history books make.
f. If you are really looking for an expansionist, evil empire to blame for everything in a simple world view, then you need not look any further than the good Ol' US of A, UK, France or Germany. Blaming everything on Russia doesn't quite fit the facts.