What would you do if the other parties in negotiation process Won't Play Fair?

Thanks 

Basically in most kind of negotiations there are rules unless one of parties is negotiate for the survive only, so each parties have to abide by mentioned rules or all negotiation should be started again from the zero point 

Thank you for inviting me to answer this question. I agree with Mr. Obaid's answer.

Simply will leave the negotiation and will cancel the deal.

Thank you for this invitation, as I was confident and steadfast of this, this may require a call to me because this is the introduction of the evidence to bring evidence and evidence and progress Bdah against these manipulations?

I'm a fan of fair negotiations by default. But if the other party goes dirty - I always have a couple of tricks in hand to show that I can play those games too. After I do so - the opponents usually prefer to withdraw and get back to a respectful way.

The idea is to show that you're no fool here and they won't get the things easy. But if they don't stop manipulative attempts - I obviously quit.

Thanks for invitation,

agree with the answer of Mr. Omar Saad.

I think, a better negotiation can change the deal but if still its not becoming something productive then will find any alternative solution to close the deal until it cancels

The worst case scenario & ultimate decision would be to backout & cancel the negotiation, but before this; explain your position to them regarding fair negotiations & a win-win win situation that you are willing to achieve and give them a second chance to sort out themselves, if they fail & show no interest in achieving a common goal of "fair or wim-win" situation, then you can backout or cancel the negotiations.Thanks for the invitation

Sir, Thanks for your invitation.There are rules for negotiations and contract to make a perfect deal so if any thing happen else except that you agreed you can canceled and stopped these deal