In addition to Challenger 2 tanks, the UK will give Ukraine 30 AS90s self-propelled guns.
"A squadron of 14 tanks will go into Ukraine in the coming weeks after the Prime Minister told President Zelenskyy that the UK would provide additional support to aid Ukraine’s land war," the UK Government website says.
Around 30 AS90s, which are large, self-propelled guns, operated by five gunners, are expected to follow. The Defence Secretary will set out further details of this support in the House of Commons on 16 January.
The UK will begin training the Ukrainian Armed Forces to use the tanks and guns in the coming days, as part of wider UK efforts which have seen thousands of Ukrainian troops trained in the UK over the last six months.
The main user is the British Army. Licensed production of towers has been established in Poland for the Krab howitzers.