$ 0 0 The Saudis still haven't locked in the massive arms deals Trump touted, and they're still talking to Russia about its advanced S-400 air defense systemSEE ALSO: Saudi Arabia's ambitious new crown prince is reportedly hiding out on his superyacht, 'fearing for his security'Join the conversation about this story »NOW WATCH: Why the Saudi crown prince met with Trump, Oprah, Bill Gates, and Jeff Bezos