UN Chapter six operations (AKA Peacekeeping) are predicted on the idea that both sides want peace, or at least are no longer interested in actively persuing hostilities. Canada's mission to Cyprus was a perfect example of this sort of thing.
UN Chapter Seven, as noted, are predicted on continuing hostilities on the part of one or more of the warring parties. NATO Non Article Five missions (such as Bosnia) are very similar except that NATO chooses to intervene and there has been no attack against a NATO partner, while Article Five is the "Three Musketeers" phase, an attack against a NATO member is considered an attack against all NATO members, and so the full power of the Alliance can be harnessed to defeat the aggressor.
WRT your reference, I think this guy is smoking crack, since the best and most effective way to conduct constabulary, peacekeeping and even Low Intensity Conflict (LIC) is to have boots on the ground (i.e. more ground forces), a strong and unified command structure (Multinational or not) and robust Rules of Engagement (ROE's), so transgressors cannot find "grey areas" to work in. The general consensus among soldiers (particularly in the Army.ca community) is that Peacekeeping is a mission, not a role, and that well equipped, well trained and highly skilled soldiers can perform this role without too much difficulty (since they can always perform military missions in the Area of Responsibility should the need arise), while a specially raised Peacekeeping or Constabulary type force has no recourse should one or more hostile parties attempt to renew the conflict.
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