But they hit very strong Ukrainian resistance almost everywhere and faced serious logistical problems with poorly motivated Russian troops suffering shortages of food, water and ammunition.
Ukrainian forces were also quick to deploy Western supplied arms such as the Nlaw anti-tank system, which proved highly effective against the Russian advance.
By October 2022, the picture had changed dramatically and, having failed to take Kyiv, Russia withdrew completely from the north. The following month, Ukrainian forces recaptured the southern city of Kherson.
Since then, the battle has mostly been in the east of Ukraine with Russian forces slowly gaining ground over many months – military experts estimate between 165,000 and 235,000 Russian service personnel have been killed since the invasion.
Ukraine last updated its casualty figures in December 2024, when President Zelensky acknowledged 43,000 Ukrainian deaths among soldiers and officers. Western analysts believe this figure to be an under-estimate.
By Dominic Bailey, Mike Hills, Paul Sargeant, Chris Clayton, Kady Wardell, Camilla Costa, Mark Bryson, Sana Dionysiou, Gerry Fletcher, Kate Gaynor and Erwan Rivault