Ukrainian President Volodymyr Zelenskyy has been warned to show 'gratitude' by both the US and UK at the NATO summit.

Zelenskyy expressed annoyance at the lack of a clear timeline for Ukraine to join the alliance, labelling the decision 'absurd'.

Curtin University Associate Professor of National Security Alexey Muraviev says these regions were clearly 'telling off' Zelenskyy.

"At some point in time I think Zelenskyy's office- less the President himself, but his entourage, his advisors- are kind of beginning to lose touch with reality."

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