Sir Keir Starmer is expected to urge partner nations to provide Ukrainian forces with more long-range missiles to strike Moscow's positions during talks in Britain on Friday.
Sir Keir is set to welcome Ukrainian President the Ukrainian head of state alongside referred to as "alliance of supportive nations", comprising more than 20 of supporting nations who have committed to provide the Ukrainian government protection commitments once hostilities pause is brokered.
Ukraine's president has been pleading for several weeks for more long-range weapons from the West, a step that Moscow has warned would worsen the conflict.
Ukraine's leader is journeying from the EU capital, where he conferred with European Union officials on Thursday seeking funding aid.
"The only person engaged in the ongoing war who does not want to stop the war is the Russian leader," Starmer remarked.
Sir Keir will also announce that 100 additional anti-aircraft missiles will be delivered to Ukraine earlier than planned, as outlined in a multi-billion pound agreement concluded between the UK and the Ukrainian government in March.
The Ukrainian president travels off the back of significant diplomatic successes in recent days: Washington's action to finally apply additional restrictions against Moscow, and European countries agreeing to finance Ukraine's financial gap.
Sir Keir is seeking to continue the momentum by intensifying the pressure on Moscow to discuss a resolution to the hostilities.
Sir Keir will urge leaders to expand the delivery of advanced missile technology following a productive attack on a manufacturing site in the Bryansk region, Russia, using Britain-delivered Storm Shadow missiles.
"Furthermore, his brutal assaults on young children in a preschool this week demonstrate that abundantly clear," he added.
Two children were included in no fewer than seven killed in a wave of enemy assaults on Ukraine, which struck a nursery in the second biggest city Ukraine's second city.
The Prime Minister will confer with supporting countries on approaches for remove Russia's petroleum resources off the global market.
Delegates will furthermore examine utilizing seized Moscow funds to supply Ukraine with monetary support, though the proposal faced divided opinions and jurisdictional challenges at the EU conference on the previous day.
European Union stopped short of agreeing an initiative to utilize as much as €140 billion in frozen Russian assets to economically support Ukraine.
Nevertheless, the leaders decided to assist with the country's "financial needs" for the coming 24 months.
America also announced measures on midweek against the Russian major oil companies, Rosneft and the private firm, as component of initiatives to add economic pressure on Russia to begin ceasefire negotiations.
Russia launched its comprehensive attack of the country in early 2022. Russian troops currently controls about one-fifth of Ukraine's soil, encompassing the Crimean peninsula Russia took control of in 2014.
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