It has been one year since Russia invaded Ukraine. It was supposed to be a quick military exercise - but instead has developed in a huge conflict, leading to thousands of deaths. Defence and security expert Michael Clarke shares his five key moments from the conflict so far. Zelenskyy in Kyiv: https://www.youtube.com/watch?v=WJEffc9DcOQ Russian convoy retreats from Kyiv: https://news.sky.com/story/ukraine-war-drone-footage-shows-russian-tank-column-retreat-after-artillery-ambush-12562334 Siege of Mariupol: https://www.youtube.com/watch?v=mvbSe2UnBwI Kerch Strait bridge attack: https://www.youtube.com/watch?v=6ZFPYm_TDPI Russia withdraws from Kherson: https://www.youtube.com/watch?v=BlphofYaxE8 SUBSCRIBE to our YouTube channel for more videos: null Follow us on Twitter: 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 Sky News videos are now available in Spanish here/Los video de Sky News están disponibles en español aquí: https://www.youtube.com/channel/UCzG5BnqHO8oNlrPDW9CYJog Sky News videos are also available in German here/Hier können Sie außerdem Sky News-Videos auf Deutsch finden: https://www.youtube.com/channel/UCHYg31l2xrF-Bj859nsOfnA To enquire about licensing Sky News content, you can find more information here: https://news.sky.com/info/library-sales