The country is under threat. Russian aggression, war in the Middle East and a military which has been ‘hollowed out’ for decades have all led to a crisis point for the United Kingdom. In a special episode of This Is Why, Britain’s most senior military official has explained why he believes this is the most dangerous moment in his 35-year career. In a wide-ranging interview with Niall Paterson, the Chief of the Defence Staff – Air Chief Marshal Sir Richard Knighton – has also revealed: How John Healey’s resignation as defence secretary took him by surprise The battle for more military spending, and what to do with the money Why it’s vital to have an honest conversation about national resilience There is more exclusive content with Sir Richard Knighton on the new Sky News Defence Insider app. Sky News Defence Insider is a subscription app designed for audiences seeking deeper insight into defence, security and global affairs. Download and subscribe here: https://skynews-defence.noosphere.app/ Paid subscription required for full access. UK only. 18+. T&Cs apply. Have you got a question for Niall? Email us: [email protected] #defence #politics #military SUBSCRIBE to our YouTube channel for more videos: http://www.youtube.com/skynews Follow us on X: https://twitter.com/skynews Like us on Facebook: https://www.facebook.com/skynews Follow us on Instagram: https://www.instagram.com/skynews Follow us on TikTok: https://www.tiktok.com/@skynews For more content go to http://news.sky.com and download our apps: Apple https://itunes.apple.com/gb/app/sky-news/id316391924?mt=8 Android https://play.google.com/store/apps/details?id=com.bskyb.skynews.android&hl=en_GB Why not listen to one of our podcasts? This is Why, available for free here: https://podfollow.com/thisiswhy or Ed Conway's Stuff Matters, available here: https://podfollow.com/stuff-matters To enquire about licensing Sky News content, you can find more information here: https://news.sky.com/info/library-sales