European leaders have said "now is a critical moment" to ramp up support for Ukraine and put pressure on Russia to bring an end to the war.
Ukrainian President Volodymyr Zelensky met UK Prime Minister Keir Starmer, French President Emmanuel Macron and German Chancellor Friedrich Merz in London on Monday to discuss the latest version of a peace plan, drafted between Ukrainian and US officials last week.
The European leaders said more work was needed to obtain security guarantees for Ukraine, as the US puts pressure on Kyiv to agree a swift deal with Russia.
Zelensky, who travelled on to Brussels to meet Nato officials, said that Ukraine would share a revised plan with the US on Tuesday.