Nato states have said Ukraine can join the military alliance "when allies agree and conditions are met" after President Volodymyr Zelensky criticised the "absurd" delay to accession.
In a communique, Nato said it recognised the need to move faster but would not be drawn on a timeframe.
Earlier Mr Zelensky said there seemed to be "no readiness" to invite Ukraine to Nato or make it a member.
He is now in the Lithuanian capital Vilnius, where the summit is happening.
Kyiv accepts it cannot join Nato while it is at war with Russia but wants to join as soon as possible after fighting ends.
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