Friend and foe alike are condemning this act, with the United States speaking in particularly guarded terms. It's too early to judge whether this act was justified, although much of the Western world already has. Netanyahu left Canada for home and has scrapped a Tuesday meeting with President Obama.
It's also too early to tell, but this could provide a huge test for Obama. He has shown to be in over his head on foreign affairs before and his still reeling from his mishandling of the Gulf oil spill. The American public is already split on what this country's allegiance to Israel should be, and liberal presidential administrations have tended to see Israel as the bad guy in its conflict with Palestine. With Europe and the UN already seemingly convicted Israel on in this matter, Obama's response will be critical.
And as many pundits have written in recent days, Obama's governing philosphy seems to be the same "vote present" philosphy of his days as a lawmaker; in other words, stay away and hope the problem goes away. This strategy is failing him, terribly. It is one he cannot employ in this matter.