ISRAEL - Israeli politician Yair Lapid on Saturday challenged the US to boot Turkey from the F-35 stealth fighter program for taking delivery of advanced Russian air defense systems in defiance of US warnings. Russia’s S-400 is considered one of the most advanced and feared air-defense systems in the world. The US has long argued Turkey’s purchase of the Russian system not only risks the security of NATO members, it also violates the 2017 law threatening sanctions for any purchase of sophisticated Russian technology — the Countering Russian Influence in Europe and Eurasia Act of 2017. “The US has to cancel the F-35 deal with Turkey, otherwise nothing will stand in Turkey and Iran’s way as they learn how to neutralize America’s most advanced weaponry,” Lapid tweeted.