The head of NATO on Friday called for "robust" security guarantees for Ukraine to ensure Russia upholds any potential peace deal and "never again" attempts to invade Ukraine.

The question of eventual security guarantees for Ukraine has been front and centre during the latest US-led diplomatic push to broker a peace deal to end the conflict, now in its fourth year.

"Robust security guarantees will be essential and this is what we are now working to define," Mark Rutte said during a visit to Kyiv, speaking alongside Ukrainian President Volodymyr Zelensky.

US President Donald Trump, who hosted a meeting of European leaders with Rutte and Zelensky on Monday, said Russia had agreed to some Western security guarantees for Kyiv.

But Moscow later cast doubt on any such arrangement. Foreign Min

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