If Israel withdrew to the 67 borders there would be full recognition of Israel and normalisation of ties with Arab states (Saudi Peace Initiative). Then Israel wouldnt fear its neighbours acquiring their normal share of defense weapons. But with no peace treaty Israel is able to receive US military aid and carry out cross border attacks justifying it with the current situation.So Saudi Arabia has the right acquire whatever weapons it wants. It has offered peace to Israel but Israel is the one who rejected it in 2002.
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from the article: 'Bush sold Arab states arms in violation of deal with Israel'