Weird thing in the sky of Montreal, Canada

At first glance it looks like it is the sun, but the sun is visible next to the object. Then maybe it could be a sun arc, a part of a so-called Halo but that does not seem to be the case either.
Source:​http://ufosightingshotspot.blogspot.com
FULL CREDIT to ​Ali G. https://youtu.be/T4m3nKWFqC8

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