The government said Mr Sunak will confirm today the further provision of hundreds of air defence missiles and further unmanned aerial systems, including hundreds of new long-range attack drones with a range of over 200km.
Mr Zelenskyy said his discussions with Mr Sunak would cover “very important issues, urgent support for Ukraine”.
The government said the extra provisions to be confirmed later today will be delivered in the coming months.
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Earlier today, Mr Zelenskyy called Russian president Vladimir Putin a “despot” in a video address to the Copenhagen Summit, as he issued a new appeal to NATO to make a “positive political decision” on Kyiv’s membership bid at a July summit.
On Saturday, the German government promised Kyiv its biggest military support package so far, with further arms deliveries worth €2.7bn (£2.35bn).
France also pledged further military aid, as President Emmanuel Macron and Mr Zelenskyy met in a surprise summit in Paris on Sunday.
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Zelenskyy calls Putin a ‘despot’
Mr Macron’s office said France will supply dozens of light tanks and armoured vehicles “in the weeks ahead”, without giving specific numbers.
Britain has been one of the largest suppliers of military aid to Ukraine since February 2022’s invasion, contributing £2.3bn worth of support last year and pledging a similar amount for 2023.