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, with at least 70,000 Russian troops killed – and an estimated 500,000 being either killed or injured in total, according to the UK Ministry of Defence.
By Dominic Bailey, Mike Hills, Paul Sargeant, Chris Clayton, Kady Wardell, Camilla Costa, Mark Bryson, Sana Dionysiou, Gerry Fletcher, Kate Gaynor and Erwan Rivault
