A Russian Neighbor Took a Step Toward Allowing Nuclear Weapons There. Moscow Warns of 'Significant Escalation.'

Russia warned Lithuania that following through on preliminary steps toward allowing nuclear weapons in its country would be considered a "significant escalation." (Credit: Getty Images)

Russia warned Lithuania that following through on preliminary steps toward allowing nuclear weapons in its country would be considered "another significant escalation."

The threat came after the Lithuanian parliament voted in favor of lifting a constitutional ban on nuclear weapons in its territory. The definitive vote will take place in January.