Donald Trump is threatening to scale back US military commitments in South Korea - at the risk of wider instability across Asia. At the same time, the US president reaffirmed his “good relationship” with North Korean leader, Kim Jong Un. So, why is Washington apparently willing to change its approach to diplomacy and security in the region? In this episode of This Is Why, Niall Paterson is joined by Professor Ramon Pacheco Pardo to examine the shifting balance of power on the Korean Peninsula and what a reduced US military presence could mean for their allies across the Asia-Pacific. Have you got a question for Niall? Email us: why@sky.uk. 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