At what point would you pull up?
Not sure what you mean? If you mean, at what point would I dial back Australia's contribution in the face of lack of cooperation, well I guess a lot of that would come down to how much the electorate can bear and how close we are to gaining cooperation.
As a general rule though I wouldn't think going out on our own and imploring others to follow would be the best strategy. I'd rather get some small cooperative wins early, build trust and progress from there.