"Americans are questioning the value of their global leadership, so countries like Canada have to be prepared to step."
Step how?  Step where?  The missing word would appear to be either "up" or "in."

I beg to differ.  No, Canada does NOT need to spend $62 billion additional dollars.  Whatever spending is done  should be allocated to defend and safeguard Canadians here, at home.  Any military money spent in the Middle East or Africa is wasted.  Buy the jets, build the ships, beef up cyber defense and help prevent radicalization that endangers Canadians right here. That's it, that's all.  

Americans are slow to learn: it's taken them close to 70 years to finally "question the value of their global [military] leadership"--or whatever else you might want to call it (and plenty of words come to mind.)  Let's learn some lessons from them, Canada.