Andriy Yermak, the head of the Ukrainian presidential staff, said more than 9,000 civilians, including 453 children, had been killed in Ukraine since Russia’s invasion. Speaking at the World Economic Forum in the Swiss resort of Davos, Yermak added that Ukraine wanted a special international tribunal to try Russian political leaders and reparations for the destruction caused by Russia’s invasion.

Rescue workers on Tuesday found the body of a child in the rubble of the high-rise residential building in Dnipro struck by Russia at the weekend, and the city’s mayor Borys Filatov, said the official death toll had risen to 44.

The Ukrainian presidential adviser Oleksiy Arestovych has tendered his resignation after a public outcry over comments he made suggesting the Russian missile that struck the building in Dnipro had been shot down by Ukraine.

An educational facility in Kupiansk in the Kharkiv region has been struck by an S-300 missile and “almost completely destroyed” according to regional governor Oleh Synyehubov.

Russia and Ukraine have been working on a large prisoner exchange deal which will include 1,000 people in total, Turkish ombudsman Seref Malkoc said.

Britain will send a squadron of Challenger 2 tanks to Ukraine to help push back Russia’s invasion, the defence secretary, Ben Wallace, has confirmed.

Germany should take “decisive actions” and send “all sorts of weapons” to Ukraine to help its troops defend themselves against Russia’s invasion, Poland’s prime minister, Mateusz Morawiecki, has said. Speaking in parliament, he implicitly criticised the German chancellor, Olaf Scholz, for his reluctance to supply Kyiv with heavier weaponry.

Germany’s foreign minister, Annalena Baerbock, and her Dutch counterpart, Wopke Hoekstra, condemned the deportation by Russians of thousands of Ukrainian children. Russia “must account for the whereabouts of these children”, Baerbock said at a joint news conference with Hoekstra, who said this “deliberate Russian policy” is “tearing families apart and traumatising children”.

Serbia’s president has called on Russia to stop recruiting Serbs to fight alongside its mercenary Wagner Group in Ukraine. Aleksandar Vučić criticised Russian websites and social media groups for publicising adverts in the Serbian language in which the Russian private mercenary group calls for volunteers to join its ranks.