Sir Keir Starmer has initiated a review of Britain’s war plans due to increasing threats from Russia, particularly concerning its support for Ukraine. The Cabinet Office is updating the homeland defense plan to address potential missile, cyber, and nuclear attacks, including scenarios for protecting government officials and maintaining services during wartime. Recent assessments revealed vulnerabilities in the UK’s air defenses, prompting calls for a missile defense system similar to Israel’s Iron Dome, amidst a surge in state threat investigations by MI5.