Barak is Israel's defense minister and his priority is to look out for Israel's interests not worrying after what what America would like. Barak has also proven to be a great negotiator when it comes to defense contracts. Before Barak along Israel was having second thoughts about buying the F35 because of its cost and the fact the Pentagon was against letting Israel it instal any of its systems. Barak then negotiated a deal whereby the US would let us install our own systems ( something not even the countries who invested billions of dollars in F35 development got ). Israel will be the first country outside the US to get its planes all the countries that invested big money are on a waiting list. Not only did he get permission to instal Israel's systems but its bomb bays would be modified to take Israeli made missiles and Israel would build the wings for a third of global F35 sales worth $2-3 billion to Israel. He negotiated a deal so the US would continue to help fund the development of Arrow 3 despite the fact US companies were lobbying to cancel support for Arrow and push for the sale of an American system. He also convinced the US to pay for two Iron Dome batteries. He may have been an awful PM and nothing special as defense minister but as defense business negotiator the man has probably been the best there has ever been. I doubt he will get anything like $20 billion extra and he knows it but he is going to do what he does best and negotiate hard to get as much as possible.
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from the article: Israel may ask U.S. for $20 billion more in security aid, Barak says