The British Army's Pathfinder unit have a unique operation in Ukraine and gave rare access to the build-up.

Hundreds of British paratroopers explain why they are there and how the the biggest parachute drop for decades has worked in a pandemic.

It all focuses on the threat from Russia, a Ukrainian general told Sky News, with tensions with Moscow worsening on the border.

SUBSCRIBE to our YouTube channel for more videos: http://www.youtube.com/skynews

Follow us on Twitter: https://twitter.com/skynews and https://twitter.com/skynewsbreak

Like us on Facebook: https://www.facebook.com/skynews

Follow us on Instagram: https://www.instagram.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