LONDON — When Ukrainian President Volodymyr Zelenskyy arrives at 10 Downing Street on Monday, he can expect to be greeted with open arms.

Not just from British Prime Minister Keir Starmer, but also French President Emmanuel Macron and German Chancellor Friedrich Merz, who are traveling to London in what's being billed as yet another show of support from Ukraine's united European allies, or, as Starmer has called them — "a coalition of the willing."

But even as Europe rallies around him, Zelenskyy's ongoing struggle to secure firmer commitments from the Trump administration could mean Kyiv is heading into its toughest battle yet: navigating a grueling, nearly four-year-old war while its most powerful ally wavers — and as Russia shows no sign of softening its demands.

Last month, the Tr

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