Ukraine declared it would not settle for anything less than NATO membership to guarantee its future security, as the alliance sidestepped Kyiv's call for an immediate invitation at a foreign ministers' meeting on Tuesday.

In a letter to his NATO counterparts ahead of the meeting, Ukrainian Foreign Minister Andrii Sybiha said an invitation would remove one of Russia's main arguments for waging its war: preventing Ukraine from joining the alliance.

Although NATO has stated that Ukraine's path to membership is "irreversible," the alliance has not set a date or issued an invitation. Diplomats said there was currently no consensus among its 32 members to do so.