By Tom Balmforth, Yuliia Dysa and Pavel Polityuk

LONDON/KYIV (Reuters) -Ukraine's Volodymyr Zelenskiy flies to Washington on Monday under heavy U.S. pressure to agree a swift end to Russia's war in Ukraine but determined to defend Kyiv's interests - without sparking a second Oval Office bust up with Donald Trump.

The U.S. president invited Zelenskiy to Washington after rolling out the red carpet for Vladimir Putin, Kyiv's arch foe, at a summit in Alaska that shocked many in Ukraine, where hundreds of thousands have died since Russia's 2022 invasion.

The Alaska talks failed to produce the ceasefire that Trump sought, and the U.S. leader said on Saturday that he now wanted a full-fledged peace deal and that Kyiv should accept because "Russia is a very big power, and they're not".

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