VILNIUS, Lithuania — NATO leaders are gathering in this Baltic nation for their annual summit, and Ukraine is top of the agenda. Member states are set to discuss further military aid and political support for Ukraine, while Kyiv wants specific pledges on when and how it can join the defense alliance. But with the Biden administration among those reluctant to set clear preconditions for Ukraine while the war with Russia is ongoing, the key question for the alliance may be what else it can negotiate during the two-day summit to provide reassurance to Kyiv and send an unequivocal message to Moscow.
