US must have been aware of the fact the funds to Pakistan will be utilized for bank rolling terrorist out fits.
US had gone ahead on the assumption that this gesture would enable US to have access,as a token, to Intelligence and leverage in Pakistan.
Now that the major issue of killing Osama is over, US can afford to be belligerent.
Pakistan can do nothing about it,like a dumb expressing a dream.(my father used a slight variation to this,Tamilians may know of it,especially Brahmins)
The U.S. and Pakistan are engaged in a billing dispute of sizable proportions, sparring behind closed doors over billions of dollars Washington pays Islamabad to fight al Qaeda and other militants along the Afghanistan border.
Related:

Much of the information-gathering network of Pakistan’s supreme security service was curtailed in the tribal areas in General Pervez Musharraf’s era, consequently giving the edge to America’s Central Intelligence Agency (CIA), it is reliably learnt.
The entire territory of North and South Waziristan was given in the direct access of the CIA which has since developed its stronghold in the belt.
Yet Pakistan says it did not collaborate with the US.
If true , this should be the greatest failure on the intelligence front.
