Sir Keir Starmer will discuss the importance of Ukraine's sovereignty in talks with Donald Trump next week, he said in a call with the country's president.
The UK prime minister reiterated the UK's \"ironclad support\" for Kyiv when he spoke to Volodymyr Zelensky on Saturday.
The two leaders held their second telephone conversation in four days following US President Trump's decision to re-open relations with Russia and seek an end to the war in Ukraine.
About 2,000 people marched to the Russian embassy in west London ahead of the third anniversary of Vladimir Putin's full-scale invasion.
According to a Downing Street spokesperson the prime minister also said \"Ukraine must be at the heart of any negotiations to end the war\" and it could be sure of \"the UK's commitment to securing a just and enduring peace to bring an end to Russia's illegal war\".
Giving details about the phone call, Downing Street said Sir Keir and Zelensky \"agreed that this was a significant moment for the future of Ukraine and European security at large\".
Sir Keir also told Zelensky \"that safeguarding Ukraine's sovereignty was essential to deter future aggression from Russia\".
The prime minister added \"he would be progressing these important discussions in the coming days and weeks, including with Trump whilst visiting Washington DC next week\".
Zelensky said he had a productive talk with Sir Keir, with the pair coordinating \"our military cooperation, joint steps, and engagements for the coming week, which will be very active\".
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