Sky's security and defence editor Deborah Haynes has been given rare access to an underground military base in eastern Ukraine that is so secret that soldiers must change into civilian clothes when they step outside. Inside the base, she spoke to Lieutenant Colonel Arsen Dmytryc - call sign Lemko - the chief of staff of 1st Corps Azov of the National Guard of Ukraine, who highlighted the territory his troops have helped to recapture. The Azov Corps claims to have killed or wounded thousands of Russians, but they have suffered losses too - and talk of surrendering the land in a peace deal is seen as unacceptable to Ukrainian forces. Read more: https://trib.al/dZTTkuj #Ukraine #Military #War #Russia #WorldNews SUBSCRIBE to our YouTube channel for more videos: http://www.youtube.com/skynews 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 Daily podcast is available for free here: https://podfollow.com/skynewsdaily/ To enquire about licensing Sky News content, you can find more information here: https://news.sky.com/info/library-sales