Russia's military dwarfs Ukraine's by comparison, so it was expected that Ukraine would fall under Russian occupation quickly. One month later and Russia have made very little progress and Kyiv, the capital, remains under Ukrainian control. Given the overwhelming odds stacked against the Ukrainian military, why has the Russian military failed to conquer Ukraine?

Charmaine Cozier takes a closer look at where the Russian military have made their mistakes. Producer: Christopher Blake

(Russian tank destroyed by Ukrainian forces on the side of a road in Lugansk. Credit: Anatolii Stepanov /Getty Images)