To start with, Lavi would have been far far far from being the most advanced fighter even it had been completed. Aerodynamic body design is not original at al, it is an F16 with canards for gods sake!! Plus, it was designed to use a PW engine produced not by Israelis but the Americans whose poor taxpayers would have had to fund a fighter project for another country. Arens also says that Israel will not be able to install its own avionics on F-35, even crows would laugh for this argument. When did you see Israelis to act legally and abide by regulations ? They deceived the Americans id Dimona and doing the same with F-35 would be even easier, much easier.
4 UN peacekeepers injured in Sinai and taken to hospital in south Israel (Haaretz)
from the article: F-35 - take it or leave it