On the frontlines of Ukraine's war against Russia

As the world marks the first anniversary of Russia’s invasion of Ukraine, we hear from the conflict's front line in the east of the country.

Also in the programme:We meet the American teenager who's just cycled from the far north of Alaska to the far south of Argentina and is contemplating repeating the journey to get back home.
And we find out why ancient trees are so important to our ecology and history.

Julian Worricker is joined by two guests to discuss the news and issues of the day. Laleh Khalili is Professor of International Politics at Queen Mary University of London and Andrea Sella
is Professor of inorganic chemistry at University College London.

(Picture: Ukrainian servicemen of the 80th Independent Air Assault Brigade fire a Howitzer D-30 artillery weapon towards Russian troops, as Russia's attack on Ukraine continues, near the frontline town of Bakhmut, Donetsk region, Ukraine February 24, 2023. REUTERS/Marko Djurica TPX IMAGES OF THE DAY)