By Laura Gozzi
BBC News
Russian soldiers are dying in greater numbers in Ukraine this month than at any time since the first week of the invasion, according to Ukrainian data.
The Ukrainian data shows 824 Russian soldiers dying per day in February.
The figures were highlighted by the
UK's Ministry of Defence. The figures cannot be verified - but the UK says the trends are "likely accurate".
The increase comes as Ukrainian officials say that Russia has launched a "big offensive".
However, the secretary of the National Security and Defence Council of Ukraine (NSDC), Oleksiy Danilov, also said Russia is experiencing "big problems" with the campaign.
"Our troops are repulsing [the offensive] very strongly," Mr Danilov said. "The offensive they planned is already taking place, gradually, but it's not the offensive they imagined."
Last week, Ukraine's outgoing defence minister, Oleksiy Reznikov, said they were anticipating a new Russian offensive
around 24 February - the anniversary of the full-scale invasion.
Some of the fiercest fighting has been around Bakhmut in the east of the country.
On Sunday, the head of Russia's Wagner mercenary force said the group had seized a settlement near the devastated city.
Yevgeny Prigozhin said on Telegram: "Today, the settlement of Krasna Hora was taken by assault detachments of the Wagner PMC."