The money Sisi got from the Gulf is money he is supposed to use to buy petroleum products from the Gulf, and others (probably Israel, BG, Union Fenosa and Noble Energy), and the money has to be paid back.
It is like I give you $100 to buy goods from my own shop, and from my friends’ shops, and then you have to also pay me back the $100, with riba. So…the “aid” is actually me taking your money, not once, not twice, but three times.
This is called investing in Egypt. Triple robbery.