VILNIUS, Lithuania — NATO leaders are gathering on this Baltic nation for his or her annual summit, and Ukraine is high of the agenda. Member states are set to debate additional navy assist and political help for Ukraine, whereas Kyiv desires particular pledges on when and the way it can be part of the protection alliance. However with the Biden administration amongst these reluctant to set clear preconditions for Ukraine whereas the battle with Russia is ongoing, the important thing query for the alliance could also be what else it might probably negotiate through the two-day summit to supply reassurance to Kyiv and ship an unequivocal message to Moscow.