Curious situation. Freeland gives a completely delusional estimate of the world situation- the US with the  ~ $1 trillion CAD it spends on "defence", it's 700 bases, it's 11 carrier battle groups, its wars in Iraq, Syria, Yemen, Afghanistan, the world's largest economy and the driving force culturally is going to retreat from the world....because Trump say so. That's utter nonsense. 

"But what about Paris"? So what. It wasn't going to achieve anything and US companies will still be going all out to make and market "green" technology. 

"What about defending ourselves?" From whom? Why would they attack us and not the US? How would even doubling the defence budget stop someone capable and with the motive to attack us if they knew the US would do nothing? But of course the US would do something which makes the whole "we can't defend ourselves" narrative ludicrous. 

That said defence tub thunpers seize on Freeland's delusions as proof we need to spend more on defence. Strange bedfellows.