Sir Keir Starmer is expected to urge partner nations to supply Ukrainian forces with more extended-range weaponry to target Moscow's positions during talks in the UK capital on Friday.
Britain's leader will host Ukrainian President the Ukrainian head of state alongside what's known as "alliance of supportive nations", consisting of more than 20 of Ukraine's allies who have pledged to offer Ukraine security guarantees once hostilities pause is brokered.
Zelensky has been urging for several weeks for additional long-range weapons from Western nations, a move that Russia has stated would worsen the conflict.
The Ukrainian president is journeying from Belgium, where he conferred with EU leaders on the previous day requesting financial support.
"The only person participating in this conflict who refuses to halt the fighting is President Putin," Sir Keir said.
Sir Keir additionally reveal that a hundred extra anti-aircraft missiles will be supplied to Ukraine ahead of schedule, as outlined in a £1.6bn deal concluded between the United Kingdom and the Ukrainian government in last spring.
The Ukrainian president travels off the back of two diplomatic wins in recent days: Washington's action to finally apply further sanctions against Moscow, and EU nations deciding to support Kyiv's budgetary shortfall.
Sir Keir is aiming to sustain the momentum by escalating the leverage on Russia to pursue a resolution to the war.
Sir Keir will urge delegates to ramp up the provision of extended-range systems following a productive strike on a chemical plant in the Bryansk region, Russia, using UK-provided Storm Shadow missiles.
"Additionally, his horrific assaults on small children in a nursery in recent days make that perfectly obvious," he added.
Two children were among a minimum of seven lost in a wave of Moscow's attacks on Ukrainian territory, which struck a preschool facility in the second biggest city the eastern city.
The Prime Minister will confer with partner nations on how to take Moscow's energy exports out of worldwide commerce.
The participants will also consider employing blocked Russian resources to supply the Ukrainian government with financial loans, though the plan experienced a lack of political consensus and legal hurdles at the EU conference on the previous day.
European Union declined to approving an initiative to utilize up to €140bn in blocked Moscow funds to financially prop up Kyiv's finances.
Nonetheless, the participants consented to help support Kyiv's "economic requirements" for the coming 24 months.
America furthermore revealed sanctions on recently against Russia's two largest petroleum firms, Rosneft Oil and Lukoil, as part of efforts to apply economic pressure on Russia to commence hostility discussions.
The Russian government began its major offensive of Ukraine in early 2022. Russian troops presently holds about one-fifth of Ukraine's soil, comprising the southern Crimea peninsular the Russian government annexed in 2014.
Elara Vance is a tech journalist with over a decade of experience covering emerging technologies and consumer electronics.