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Neptune
As we know that NATO is persisting/pressurizing Mr.Karzai to sign deal with united states before their withdrawl of troops which concludes following points:
-The US/NATO has decided to reshape their strategy.
-They have decided to continue their war after 2014,in order to assure in providing safeguards to their interest.
-They want to strenghten and implement results of their warfare effectively or to obtain successfully their objectives or atleast they want to keep the chances and objectives alive.
Now a question arises here that why Mr.Karzai is so not ready to sign deal with US?Why he is waiting for elections?
One more point,first loya jirga has agreed then US has approached towards Mr.Karzai for deal,which means what I think that Mr.Karzai wanted to strenghten his image ,as after invasion,he finds himself 'less influenced' as compare to wild afghan tribes,he is well aware that he is not in a position to control them in case of Taliban's presence too plus, in order to avoid history to repeat itself again Mr.Karzai is giving such impression that he is assuring to safeguard interest of Afghanistan, that is why he has clearly denied before elections.
I also believe that Mr.Karzai must deal with talibans rather then US,but he is well aware that Talibans will not give a rat's *** to him.
Americans are clever,they are well aware of Karzai's weakness,and they are well aware that Karzai will defintily want their support,that is why they are avoiding his 'dramay baazi' or demands you can say,and the why Americans are persisting to stay,I have mentioned already,they have their own interest or objectives