With most stalemated international negotiations, the reasons for both the impasse and the continuation of talks are easy to understand. A range of possible agreed outcomes exists, with some more favorable to one party and some more favorable to the other, and with each side naturally trying to get as good a deal as it can. For each party, there is at least some possible agreement that would be better than no agreement at all.
The parties keep bargaining because each would lose something if they failed to reach an agreement. If that were not the case, then one or the other of the parties would have no reason to bargain in the first place and there would be no negotiation at all.
It thus is hard to explain, or rather to justify, what is described as a negotiating impasse between the United States and Israel over the size of a new package of U.S. aid to Israel. The situation is reported as if this were one more example of a typical stalemated international negotiation, but it is not.