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Ukraine will get "a clear message, a positive message" on Nato membership, said the alliance's boss Jens Stoltenberg, reports BBC.
Ukraine wants Nato membership - but accepts it cannot join while the war against Russia continues, he added.
Jens Stoltenberg said membership can take decades to achieve, but Ukraine wants a much quicker timeline.
Nato offers collective security, as countries are obliged to defend fellow members that come under attack.
Stoltenberg was speaking as Nato's annual summit takes place in Vilnius, Lithuania on Tuesday.
Scandinavian country Sweden is also on the verge of Nato membership, after Turkey dropped its objection.
Bd-pratidin English/Golam Rosul
