Sir Keir Starmer will push supporting countries to provide Ukrainian forces with further extended-range weaponry to hit Moscow's positions during talks in Britain on Friday.
Sir Keir plans to receive President Zelensky alongside what's known as "alliance of supportive nations", consisting of more than 20 of Ukraine's allies who have committed to provide Kyiv security guarantees once hostilities pause is brokered.
Zelensky has been urging for several weeks for more extended-range systems from the West, a step that Moscow has cautions would worsen the war.
The Ukrainian president is travelling from Belgium, where he conferred with European representatives on Thursday seeking financial support.
"The single figure engaged in the ongoing war who declines to halt the fighting is the Russian leader," the Prime Minister remarked.
Britain's leader furthermore reveal that a hundred further air defence missiles will be supplied to Ukraine ahead of schedule, as detailed in a substantial financial arrangement concluded between the United Kingdom and Kyiv in March.
Ukraine's leader arrives following important international achievements recently: Donald Trump's decision to enact additional restrictions against Russia, and EU nations agreeing to fund a Ukrainian budget hole.
The Prime Minister is aiming to maintain the momentum by escalating the influence on Moscow to discuss a resolution to the hostilities.
Britain's leader will urge delegates to increase the delivery of advanced missile technology following an effective strike on a manufacturing site in the Russian city, the Russian Federation, using British-supplied missile systems.
"Furthermore, his depraved attacks on young children in a preschool in recent days demonstrate that crystal clear," he added.
Two children were among a minimum of seven fatally wounded in a wave of Moscow's attacks on Ukrainian territory, which hit a nursery in the second biggest city Kharkiv.
Sir Keir will consult supporting countries on how to remove Moscow's energy exports from international trade.
They will additionally discuss employing blocked Russian resources to supply Ukraine with monetary support, while the proposal encountered insufficient agreement and legal hurdles at the European meeting on Thursday.
European nations stopped short of consenting a plan to employ up to €140bn in frozen Russian assets to financially prop up the Ukrainian economy.
Nevertheless, the participants consented to contribute to Ukraine's "financial needs" for the upcoming biennium.
America also revealed sanctions on Wednesday against the Russian biggest petroleum firms, Rosneft Oil and the private firm, as component of initiatives to increase economic pressure on the Kremlin to enter peace talks.
Moscow began its comprehensive attack of the country in early 2022. Russian troops presently controls about one-fifth of the country's land, comprising the southern Crimea peninsular Moscow annexed in the year 2014.