Former National Security Adviser Robert O'Brien warns that Ukraine's bid to join NATO could risk 'World War III'. O'Brien suggests that while the US could offer security guarantees and sanctions on Russia, inviting Ukraine into NATO could escalate tensions with Russia and potentially lead to nuclear war. O'Brien's perspective provides insight into how a future Trump administration could handle global crises. He also discusses the need for comprehensive sanctions and the potential for Israel to normalize relations with Saudi Arabia. O'Brien downplays the threat of Iran and emphasizes China as the biggest threat to America.