"I don't think it's out of the table," he told reporters at Vilnius Airport.
Russian President Vladimir Putin's "sabre-rattling" on the Ukrainian border could be seen as an attempt to "mobilize his electorate" amid a recent dip in his popularity, according to the minister.
Landsbergis is paying the solidarity visit to Kyiv together with his Latvian and Estonian counterparts, Edgars Rinkevics and Eva-Maria Liimets.
In Kyiv, the top Baltic diplomats are scheduled to meet with Ukraine's leaders and other high-ranking officials.
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