There must be no “appeasement” of Russia, Ukraine’s ambassador in London said, adding that the UK’s help during the invasion “will never be forgotten.”
Vadym Prystaiko was addressing people in Trafalgar Square after a march through central London.
They chanted “we stand with Ukraine” and carried banners reading “stop Putin’s war” and “no-fly zone.”
Crowds cheered Kyiv Mayor Vitali Klitschko as he appeared on the big screen to address them.
Ukraine War: Live updates as Biden issues warning to Putin
Prystaiko issued a strong warning at the event, saying: “Make no mistake: if Russia ends Ukraine, it will go further west.”
There should be “no appeasement”, “no arguing with them” and “no warnings”, he said, adding: “Just stop.”
Prystaiko thanked the UK for “providing and continuing to provide us with great support”, saying that “it will never be forgotten”.
And he praised British families who had “opened their hearts and homes to displaced Ukrainians.”
“There are no more shades or nuances, just black and white: neither side can afford to lose, this is win or die,” the ambassador said.
He concluded: “We must be a light against evil. We must prevail.”
In other developments:
• Biden says Putin ‘cannot stay in power’ after meeting with Ukrainian refugees
• Powerful explosions are heard on the outskirts of the important city of Lviv
• Top Kremlin military officials appear for the first time in weeks after ‘significant’ silence
• Theater bombing survivor speaks of chaos in besieged Mariupol
Speaking before the event, London Mayor Sadiq Khan said the UK should be doing “much more” to help those trying to escape conflict.
“It is important over the next few days (and) weeks to make it much easier for those fleeing Ukraine to come here,” he added.
He told Sky News he was concerned about “complex visa forms” and “bureaucracy” and “embarrassed” by the UK’s response.
Read more: Russia says it is changing its approach. What could this mean for the war?
Home Secretary Priti Patel has said adequate security checks must be carried out.
the The first refugees have started arriving in the UK.while Transportation Secretary Grant Shapps has said he is preparing to welcome a Ukrainian refugee family into their home – along with your pet dog.
Under the Housing Scheme for Ukrainethose in the UK who have a spare room or separate self-catering accommodation that is unoccupied are asked to offer to host Ukrainians for a period of at least six months.
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